Need an impact arm or bat that can give your fantasy team a boost? Whether you're looking for an injury replacement or someone to stash on your bench, the fantasy waiver wire has a plug or long-term fix to pick up today. Check out the following 10 players -- all sitting on waivers in many leagues, and all ready to help your team in Yahoo Sports Fantasy Baseball, the Official Commissioner Game of MLB. All statistics and ownership percentages are as of Wednesday.
Kyle Barraclough, reliever, Marlins (46% owned)
Brad Ziegler was removed from the closer role last week, opening the door for Barraclough to take over Miami's ninth-inning duties. Although Barraclough's recorded just three saves since debuting in 2015, he's been a reliable late-inning option with a lifetime 2.66 ERA, 3.08 FIP and 11.7 K/9 rate. With a 1.37 ERA and a 0.91 WHIP thus far in '18, the hard-throwing 28-year-old should be universally owned.
Junior Guerra, starter, Brewers (40% owned)
Guerra started the season in Triple-A but has been excellent in 11 starts for Milwaukee since being called up, going 3-4 with a 2.83 ERA and a 1.14 WHIP. The last two months have been a return to form for Guerra, who went 9-3 with a 2.81 ERA and a 1.13 WHIP as a rookie in 2016 before slumping to a 5.12 ERA and a 1.48 WHIP in '17. The 33-year-old appears to have ironed out his control problems from last year, reducing his home run rate from 2.3 HR/9 to 0.9 HR/9 and trimming his walk rate from 5.5 BB/9 to 3.1 BB/9 while maintaining a solid 8.4 K/9 rate. If Guerra can keep his walks and homers close to his rookie rates of 0.7 HR/9 and 3.2 BB/9, he could enjoy a similar level of success this year.

Benjamin Zobrist, second baseman/outfielder, Cubs (37% owned)

Zobrist has rebounded from last season's .232/.318/.375 performance with one of his best offensive seasons in years, slashing .304/.392/.459 through 44 games with more walks (22) than strikeouts (19). His 24 percent line-drive rate and 36.2 percent hard-hit rate are both career highs for the 37-year-old, who's back to being a productive mainstay in Chicago's potent offense. His defensive versatility adds extra fantasy appeal, as he can be slotted in the outfield or middle infield.
Clay Buchholz, starter, D-backs (30% owned)
Buchholz's hot start has his ownership levels on the rise after compiling a 1.50 ERA and a 0.67 WHIP over his first three starts while recording a 14-to-2 K/BB ratio in 18 innings. Although injuries have often hampered him in the past, the two-time All-Star has had stretches of greatness before, most recently in 2015 with the Red Sox. If he stays healthy, he could bounce back in the more pitcher-friendly National League.
Nathan Eovaldi, starter, Rays (17% owned)
Eovaldi missed all of 2017 recovering from elbow surgery and opened the year on the disabled list, but he has pitched well since returning. He delivered six no-hit innings in his season debut and turned in a solid effort against the Nationals in his second start, showing good control by throwing 66 of his 86 pitches for strikes. The layoff doesn't seem to have affected his velocity, as his fastball has averaged 98.1 mph over his first two starts. With a 4.20 ERA and a 3.85 FIP over 750 career innings, Eovaldi can be a solid starter when healthy.

Jonathan Jay, outfielder, Royals (16% owned)
Jay has come on strong after a cold April, slashing .358/.392/.445 with 20 runs in 33 games since the calendar flipped to May. Kansas City's leadoff man doesn't offer much power with a career .093 ISO, but he hits for average and offers a bit of speed as well with three steals thus far in 2018. His .307/.363/.374 line aligns with his career .290/.356/.383 marks, and he should continue to be a steady source of runs from the top of the Royals' lineup.
Wade LeBlanc, starter/reliever, Mariners (13% owned)
LeBlanc opened the season out of the bullpen but has been terrific since moving to the rotation in early May, posting a 1.72 ERA and a 0.98 WHIP with a 23-to-6 K/BB ratio in 31 1/3 innings over six starts. He's been using his sinker more often, throwing it 34 percent of the time as a starter, and has been locating his changeup more effectively as well. These improvements have helped him fool hitters more frequently, as reflected by his career-high 37 percent chase rate. If he can maintain that level of deception along with his 68.3 percent first-strike rate -- also a career high -- he could continue to flourish.

Clayton Richard, starter, Padres (13% owned)
Richard has turned his season around after a slow start, going 3-2 with a 3.32 ERA and a 0.92 WHIP over his last six starts. He's pitched like an ace during that span, averaging more than seven innings per start while notching a 34-to-7 K/BB ratio and limiting opponents to a .210/.253/.338 batting line. His hot streak has lowered his ERA from 6.21 to 4.67, which could continue to improve based on his 4.04 FIP and 3.58 xFIP.
Frankie Montas, starter/reliever, A's (12% owned)
Montas has hit the ground running since making his season debut on May 27, winning both of his starts while yielding just one earned run over 14 innings. The 25-year-old has displayed good command as well with a 9-to-2 K/BB ratio. Montas demonstrated elite strikeout potential with a 10.7 K/9 rate in 47 career innings prior to 2018, but control problems resulted in a 5.6 BB/9 rate and 2.1 HR/9 rate. If he can continue to limit his mistakes and free passes, he could be headed for a breakout.

Nick Williams, outfielder, Phillies (3% owned)
The 24-year-old caught fire in May after a sluggish April, slashing .293/.369/.586 with five home runs in 65 plate appearances. The hot streak has led to more regular playing time for Williams, who batted an impressive .288/.338/.473 with 12 home runs and 55 RBIs in 83 games as a rookie last year. He's increased his walk rate from 5.8 percent to 7.1 percent while cutting his strikeout rate from 28.3 percent to 24.3 percent, so he still has room to grow if his plate discipline continues to improve. Williams' numbers could also see a boost with positive regression from his .264 BABIP.