The first week of Arizona Fall League action is in the books, giving eight Giants prospects a chance to debut with the Scottsdale Scorpions and get a taste of high-level competition in the desert.
San Francisco’s contingent is led by Maui Ahuna, a slick-fielding shortstop who is ranked the club’s No. 12 prospect by MLB Pipeline, but he won’t be the only player who will be looking to make up for lost reps and build some momentum heading into next year.
Here are three other Giants prospects to keep an eye on during the AFL slate, which will run through Nov. 15:
1. Parks Harber, 3B/1B
One of four prospects who came over from the Yankees as part of the Camilo Doval trade, Harber emerged as a quick standout at High-A Eugene, where he batted .333 with a 1.098 OPS, seven home runs and 24 RBIs over 25 games this year. The 24-year-old has continued to do damage in the AFL, where he launched a 102.8 mph, 393-foot home run in his second game for Scottsdale on Thursday.
Signed as an undrafted free agent out of the University of North Carolina last year, Harber has primarily played the corner infield in the Minors, but the Giants are planning to give him more looks in left field to increase his positional versatility.
“I think if you look at him and you’re looking at, let’s just call it high-end tools, he probably doesn’t have one that jumps off the page at you,” vice president of player development Randy Winn said. “But when you put him in a baseball uniform and you put him out on a field, he does so many things well, and that’s what led to his success this season for us.
“He’s got a really short swing. Simple swing. Able to drive the ball, a great approach in the middle of the field. He played a very, very solid third base for us this year at Eugene. We’re going to have him play probably next year, a little bit of a first, a little bit of third, a little bit of left field and expand his toolkit there a little bit. But he’s definitely a guy that’s really exciting, especially with the bat.”
2. Walker Martin, SS/3B (Giants’ No. 27 prospect)
A 2023 second-round Draft pick out of the Colorado prep scene, Martin struggled after making his pro debut last year, batting .218 with a 41% strikeout rate in 69 games between the Arizona Complex League and Single-A San Jose. The 21-year-old infielder returned to San Jose in 2025 and showed progress by cutting his K rate to 28.4%, though he’ll have to continue to make more contact to better tap into his big left-handed power.
Walker posted a .249 batting average over his final 56 games for San Jose this year, up from .218 in the first half, so the Giants are hoping he’ll keep trending in the right direction in the AFL.
“As a really young high school draftee, we’re just trying to get him as many reps and as many at-bats as possible,” Winn said. “I thought he had a year that was a tale of two halves. He really played like a completely different player in the second half, so we’re just hoping that he’s able to take that confidence that we feel like he gathered and gained in the second half of the season and take that into the Fall League and hopefully have another jump.”
3. Spencer Miles, RHP
Miles was a fourth-round Draft pick out of Missouri in 2022, but he’s been hampered by injuries in recent years, pitching only 14 2/3 affiliated innings since turning pro. The 6-foot-3 hurler finally completed his long road back from Tommy John surgery on Thursday, when he struck out two in a 1-2-3 eighth inning for Scottsdale.
Miles topped out at 98.4 mph with his four-seam fastball and mixed in a sinker and curveball in the 13-pitch outing, which marked his first official appearance since June 2024. The 25-year-old hasn’t pitched above Single-A, but he has the tools to potentially move quickly if he can stay healthy, especially if the Giants decide to keep him on the relief track.