Zachary Dunn Gelof was originally signed by A’s scout Tripp Faulk…graduated from Cape Henlopen High School (Del.) and was named 2018 Delaware Gatorade Player of the Year…attended the University of Virginia where he hit .316 with 16 home runs, 91 RBI and 32 stolen bases in 137 games in three seasons.
2025
Combined to play in just 77 games with the A’s (30 games) and Triple-A Las Vegas (47 games) in a season shortened by two stints on the injured list due to right hamate surgery (Mar. 26- July 3) and a left shoulder dislocation (Sept. 20-end of season), which led to another surgery...Batted .174 with two home runs, seven RBI and a .502 OPS in his 30 games over two stints with the A’s...Struck out 46 times in 101 plate appearances…averaged 2.20 plate appearances per strikeout, which was the lowest mark in the majors and third lowest in Athletics history among players with 100 or more plate appearances…now has 316 strikeouts in 948 career plate appearances (3.00 plate appearances per strikeout)...Hit .194 (13-for-67) with both of his home runs and a .570 OPS against right-handed hitters, .120 (3-for-25) with a .314 OPS against left-handers…his career splits are .250 with a .755 OPS and 30 of his 33 home runs against righties, .146 with a .462 OPS against lefties...Had a .113 batting average with the bases empty, .250 with runners on…batted .150 with runners in scoring position…is a .195 career hitter with RISP...Hit .223 on the road, .145 at home...Appeared exclusively at second base on defense where he made 26 starts…committed one error in 30 games overall at second base for a .991 fielding percentage…has just 11 errors in 237 career games at second base for a .989 fielding percentage...Started games in each of the bottom four spots in the order, including 12 hitting eighth and nine hitting ninth...Also hit .256 with 12 home runs, 31 RBI and a .888 OPS in 47 games with Las Vegas…was a perfect 12-for-12 in stolen base attempts...Struck out 54 times for an average of 3.94 plate appearances per strikeout...Of his 12 home runs, 10 gave the Aviators the lead, tying for second-most in the Pacific Coast League…13 of his 31 RBI put Las Vegas ahead...Hit .269 (35-for-130) with 10 of his 12 home runs and a .941 OPS against right-handed pitchers, .217 (10-for-46) with a .738 OPS against left-handers...Batted .299 with nine home runs and 20 RBI in 25 home games, .203 with three home runs and 11 RBI in 22 road games...Made 42 starts at second base and five at designated hitter...committed four errors for a .980 fielding percentage. Started games at each of the first four spots in the order, including 16 hitting cleanup, 14 batting leadoff, 13 from the three spot and four hitting second.
2024
Batted .211 with 17 home runs, 49 RBI and a .632 OPS in 138 games after hitting .267 with 14 home runs, 32 RBI and an .840 OPS in 69 games as a rookie in 2023...Had the lowest on-base percentage in the Majors (.270), the second lowest batting average and third lowest OPS (.632)...in full seasons, the on-base percentage was fourth lowest in Oakland history and the batting average was sixth lowest...the on-base percentage was the lowest since Scott Brosius in 1997 (.259)...Struck out 188 times, which led the American League, tied for fourth in the Majors and was fourth most in Athletics history...they are second most in Major League history by a second baseman (Yoan Moncada, 217 in 2018)...averaged 2.91 plate appearances per strikeout, which was the lowest in the Majors and the lowest in Athletics history...averaged 4.95 strikeouts per walk, which was fourth highest in the Majors...Was 25-for-28 (89.3%) in stolen base attempts and tied for the 10th best stolen base percentage in the Majors...his stolen bases ranked fifth in the Majors among second basemen...they were third most in Oakland history and sixth most in Athletics history...had the most since Davey Lopes had 28 in 1982...is now 39-for-44 (88.6%) in stolen base attempts in his career...Is the third player in Athletics history with at least 10 home runs and 10 stolen bases in each of his first two seasons in the Majors (Mitchell Page, 1977-78; Ed Charles, 1962-63)...Led the A’s in both strikeouts and stolen bases...His batting average broke down to .232 (90-for-388) with a .676 OPS against right-handed pitching compared to .138 (15-for-109) with a .479 OPS against left-handers...his average against lefties was the lowest in the Majors and the lowest in Oakland history (previously: Lance Blankenship, .145 in 1993)...hit 15 of his 17 home runs and collected 43 of his 49 RBI against righties...his career splits are .256 with a .776 OPS, 28 of his 31 home runs and 73 of his 81 RBI against righties, .149 with a .481 OPS against lefties...Batted .186 at home, which was the lowest in the majors and fourth lowest in Oakland history...hit 11 of his 17 home runs on the road...Had a .167 batting average with runners in scoring position, which was second lowest in the majors and fifth lowest in Oakland history among players with 100 or more plate appearances with RISP...it was the lowest since Jack Hannahan hit .155 in 2008...was 3-for-13 (.231) with a double, home run and seven RBI with the bases loaded...Had 12 home runs and 34 RBI in 76 games before the All-Star break, five home runs and 14 RBI in 62 games after the break.
2023
Was called up by the A’s immediately following the All-Star Break and hit .267 with 40 runs, 20 doubles, a triple, 14 home runs, 32 RBIs and an .840 OPS in 69 games in his Major League debut in just his third professional season...Was 14-for-16 (87.5%) in stolen base attempts and is one of five rookies in Athletics history with at least 10 home runs and 10 stolen bases in a season (Yoenis Céspedes in 2012, Jose Canseco in 1986, Mitchell Page in 1977 and Ed Charles in 1962)...Led Major League rookies in doubles after the All-Star Break, ranked second in extra base hits (35), third in slugging (.504), tied for third in hits (72), fourth in home runs and OPS, fifth in batting, sixth in runs, tied for seventh in walks (26) and stolen bases and ninth in RBI and on-base percentage (.337)…For the season, he ranked eighth among American League rookies in hits and stolen bases...His .504 slugging percentage was sixth best in Oakland history among rookie with 250 or more plate appearances...His 35 extra base hits are the most in Athletics history by a player over the first 69 games of his career…is tied for the fifth most doubles (20) and home runs (14)…Started a team-leading 69 games at second base and started 69 of the A’s 70 games after the All-Star Break…committed three errors for a .989 fielding percentage…led ML second basemen in putouts after the break (137), tied for second in total chances (281) and double plays (44) and ranked seventh in fielding percentage...Batted .303 (60-for-198) with 13 of his 14 home runs, 30 of his 32 RBIs and a .969 OPS against right-handed pitchers…hit .167 (12-for-72) with a .486 OPS against left-handers...Hit .296 at home, .237 with nine of his 14 home runs on the road…slugged .504 in Oakland and .504 on the road...Had a .218 batting average in July but then hit .286 in both August and September...Connected for 11 of his 13 home runs with the bases empty...Batted .246 with seven home runs in 50 games against AL competition, .320 with seven home runs and a 1.058 OPS in 19 interleague games...Made 53 starts batting second…also hit third (8), first (5), sixth (2), and seventh (1)…Began the year at Triple-A Las Vegas and hit .304 with 21 doubles, a triple, 12 home runs, 44 RBIs, 20 stolen bases and a .929 OPS in 69 games with the Aviators...The doubles and stolen bases were his most as a minor leaguer...At the time of his promotion to Oakland on July 14, he ranked third in the Pacific Coast League in doubles, tied for sixth in stolen bases, eighth in runs (60) and tied for ninth in extra base hits (34)…Hit .308 (24-for-78) with a .893 OPS against left-handed pitchers, .303 (56-for-185) with 10 of his 12 home runs and a .944 OPS against right-handers...Batted .339 with six home runs at home, .278 with six home runs on the road...Was 5-for-12 (.417) with three doubles and 12 RBIs with the bases loaded...Made 68 starts at second base and committed eight errors for a .975 fielding percentage…also made one start at designated hitter...Started games at every spot in the order except first, fourth and ninth and saw his most action with 24 games batting sixth...Was named an A’s Organization All-Star by MLB.com following the season.
2022
Made both his Double-A and Triple-A debuts in his first full professional season as he combined to hit .270 with 18 home runs, 66 RBI and an .815 OPS in 96 games with Midland and Las Vegas...Las Vegas....Tied for fourth in the A’s farm system in RBI, ranked fifth in slugging (.463), tied for fifth in total bases (180), seventh in batting, OPS (.815) and home runs, tied for eighth in walks (50) and ninth in on-base percentage (.352) and hits (105)....Batted .326 (29-for-89) with a 1.097 OPS against left-handed pitchers compared to .253 (76- for-300) with a .732 OPS against right-handers…hit 10 home runs in 89 at bats against lefties (8.9 at bats per home run), eight in 300 at bats against righties (37.5 at bats per home run)....Had a .316 average with runners in scoring position…was 5-for-13 (.385) with a double, two home runs, 14 RBI and a walk with the bases loaded....Hit 13 of his 18 home runs in road ballparks....Started 62 games at second base, 26 at third base, seven at designated hitter and one in center field…committed seven errors as a second baseman (.974 fielding percentage) and four as a third baseman (.922)....Hit .360 as a third baseman, .249 as a second baseman and .138 as the designated hitter....Made 72 starts batting second but started games in each of the first five spots in the batting order...Was rated as the A’s third-best prospect by MiLB.com and Baseball America following the season…was also named an A’s Organizational All-Star by MiLB.com...Was the RockHounds Opening Day starter at third base on April 8 at Amarillo and went 3-for-5 with two home runs and five RBI…it was his second career two-homer game and the first round tripper was a grand slam…the five RBI matched his career high…began the year with a season-high 14-game hitting streak through April 26 (24-for-68, .353) and reached base safely in 30 of his first 31 games through May 17 (.360 batting average, .411 on-base percentage)…had a season-high four hits April 10 at Amarillo…struck out a career-high four times April 15 against Corpus Christi (also Aug. 13 at Tulsa)…hit .329 in 18 games in April and then batted .301 in 21 games in May…had a 10-game hitting streak from May 5 to 17…went 19-for-42 (.451) with 10 runs, four doubles, a triple, two home runs, 14 RBI and seven walks during the streak…had eight consecutive multiple hit games from May 6-15 and four straight multi-RBI games from May 6-10 (11 RBI total)…connected for his second two-homer game of the season and third of his career when he went 2-for-3 with a career-high tying five RBI on May 8 at Amarillo…went 0-for-18 over a five-game stretch from May 18 to 22…then reached base safely in 24 consecutive games from May 24 to Aug. 16…hit .270 with a .365 on-base percentage during the streak…was placed on the injured list May 29 with an anterior labral tear and missed nearly seven weeks…was reinstated July 14…hit .315 with eight stolen bases in 39 games before the injury, .235 with two steals in 57 games after the injury…belted his second grand slam of the season July 17 at Frisco…had six home runs over his first 53 games through Aug. 7…then slugged 12 home runs over his final 43 contests… had six home runs and 23 RBI in 24 games in August…also hit six home runs in 24 games in September…was batting .271 with 13 home runs and 61 RBI in 87 games with Midland when he was moved up to Las Vegas Sept. 19…went 9-for-35 (.257) with a double, five home runs and five RBI in nine games with the Aviators…had his third two-homer game of the season and the fourth of his career Sept. 26 at Sacramento…hit .228 with three home runs and seven RBI in 21 games with Mesa in the Arizona Fall League following the season.
2021
Played for three different teams in his professional debut and hit a combined .333 with seven home runs and 30 RBI in 36 games…added 20 walks for a .422 on-base percentage…slugged .565 and had a .987 OPS...Was successful in 13-of-15 (86.7%) stolen base attempts…tied for eighth in the A’s farm system in stolen bases...Hit .336 (39-for-116) with six of his seven home runs against right-handed pitchers compared to .318 (7-for-22) against left-handers...Batted .447 with runners in scoring position…was 3-for-4 (.750) with two doubles and nine RBI with the bases loaded...Had a .344 batting average and five of his seven home runs in his home ballparks...Hit .345 in the sixth inning or later...Started 34 games on defense, all at third base…committed nine errors for a .871 fielding percentage...Also went 2-for-8 (.250) in two starts at designated hitter...Batted second in the order 32 times and had one game each in the three, seven, eight and nine spots...Was rated as the A’s number 2 prospect by Baseball America following the season.
