Kansas City Royals right-hander Stephen Kolek could start to attract some interest on the waiver wire in fantasy baseball leagues after another impressive performance on Saturday in the team's 5-0 shutout over the visiting Seattle Mariners at Kauffman Stadium. Kolek won his third game of the year by throwing a complete-game shutout with four hits allowed, one walk, and two strikeouts to lower his season ERA to an impressive 2.77. It was the 29-year-old's second career shutout, and it was also his second straight scoreless outing after throwing 6 1/3 shutout innings with a walk and three strikeouts in his last appearance on May 17 against the St. Louis Cardinals on the road. Kolek has three quality starts in his four outings for the Royals, going 3-0 with a 2.77 ERA (4.21 FIP), 0.85 WHIP, and 14:5 K:BB in 26 innings pitched. He has been impressive in a small sample size for the Royals, but regression should eventually come, and fantasy managers in mixed leagues should know that the upside is limited, as Kolek has a 16.9% strikeout rate in his career.

From RotoBaller

Texas Rangers shortstop Corey Seager (back) was scheduled to face live pitching on Sunday. That session has been postponed due to Seager not quite being where he needed to be in his recovery process. The Rangers are still figuring out the next steps for Seager, but fantasy managers shouldn't expect him back when first eligible. The organization was hopeful that Seager could be back for the upcoming homestand, but that seems doubtful to happen now. Fantasy managers should check back for another update on Seager in the coming days. Ezequiel Duran should continue seeing more at-bats while Seager is sidelined.

From RotoBaller

Los Angeles Angels first baseman Nolan Schanuel (calf) was forced to make an early exit from Saturday's game against the Texas Rangers. Schanuel appears to have suffered a calf injury while running the bases during the fifth inning. He was replaced by Vaughn Grissom at first base, who could see an extended look over there if Schanuel misses time. Before leaving Saturday's game, Schanuel was 1-for-3 at the plate with a double and an RBI. Fantasy managers should check back ahead of Sunday's game for another update on Schanuel. The Angels could potentially promote Christian Moore if Schanuel does have an extended absence.

From RotoBaller

Texas Rangers third baseman Josh Jung (shoulder) was forced to make an early exit from Saturday's game against the Los Angeles Angels. Jung was pulled out of the game in the fourth inning due to left shoulder soreness. Before exiting, Jung went 0-for-2 at the plate with a strikeout. Ezequiel Duran shifted over to third base and could see increased playing time over there if Jung misses time. The expectation is that Jung will undergo further testing to determine the severity of the injury. For now, fantasy managers should consider Jung as day-to-day.

From RotoBaller

St. Louis Cardinals starting pitcher Brycen Mautz will make his MLB debut against the Cincinnati Reds on Sunday. The Cardinals need an extra arm after a doubleheader on Saturday. They've decided to give Mautz the call after he posted solid numbers at Triple-A Memphis this season. Across nine starts, Mautz has a 2.90 ERA, 1.37 WHIP, and a 43:24 K:BB ratio this season. Mautz is a second-round pick of the Cardinals from the 2022 Draft. The expectation is that he'll head back to Triple-A after this outing, but he could be an interesting streaming option for Sunday's slate.

From RotoBaller

Minnesota Twins third baseman Royce Lewis has been putting on an impressive power show since being sent down to Triple-A St. Paul. Lewis blasted two home runs on Saturday and has five long balls in five games with St. Paul. It seems that a demotion was exactly what Lewis needed to get his head right. This power surge could be enough to get Lewis back on the Twins roster soon. The potential has always been there with Lewis, but he hasn't been able to put it all together. Lewis could be an interesting stash candidate given his strong performance in Triple-A right now. He could be on the fast track back to the big leagues.

From RotoBaller

Boston's 1B Willson Contreras scored 26.0 fantasy points going 9-for-20 with a home run and six RBIs in five games this week. Contreras is owned in 55.9% of mixed leagues.

Cincinnati Reds' 1B Nathaniel Lowe had a slash line of .353/.353/.824 going 6-for-17 with 6 RBIs in four games this week. Lowe is owned only in 2.5% of mixed leagues.

Angels' SP Walbert Urena had an ERA of 1.69 and a WHIP of 1.12 in 16 innings over his last three games. Urena is owned only in 20.8% of mixed leagues.

Toronto Blue Jays' RF George Springer scored 27.5 fantasy points going 8-for-25 with three home runs and five RBIs in six games this week. Springer is owned in 59.2% of mixed leagues.

Mets' SS Bo Bichette scored 29.5 fantasy points going 7-for-26 with three home runs and nine RBIs in six games this week. Bichette is owned in 72.2% of mixed leagues.

Red Sox's CF Jarren Duran scored 27.5 fantasy points going 5-for-19 with two home runs and seven RBIs in five games this week. Duran is owned in 67.2% of mixed leagues.

Blue Jays' 3B Ernie Clement scored 26.5 fantasy points going 8-for-19 with a home run and five RBIs in six games this week. Clement is owned only in 44.8% of mixed leagues.

Nationals' SS Nasim Nunez had three stolen bases and a .143 average in six games this week. Nunez is owned only in 20.1% of mixed leagues.

Arizona's LF Ryan Waldschmidt had a slash line of .500/.571/.611 going 9-for-18 in six games this week. Waldschmidt is owned only in 34.3% of mixed leagues.

Rangers' DH Justin Foscue had a slash line of .500/.565/.833 going 9-for-18 with 5 RBIs in five games this week. Foscue is owned only in 0.0% of mixed leagues.

Athletics' 2B Zack Gelof had three stolen bases and a .200 average with 4 RBIs in six games this week. Gelof is owned only in 30.7% of mixed leagues.

Dodgers' CF Teoscar Hernandez had six RBIs going 3-for-4 with a home run in a 11-3 win over Milwaukee on Saturday, May. 23.

Braves' SP Grant Holmes recorded 10 strikeouts in 5 innings but took the loss in a 2-0 loss to the Nationals on Saturday, May. 23.

Athletics outfielder Henry Bolte has been terrific ever since being promoted to the majors for his MLB debut. Across nine big-league games, he's slashing .310/.382/.345 with an 11.8% walk rate, a 20.6% strikeout rate, and 108 wRC+. He hasn't launched a home run in the majors yet, but we knew that he didn't have a ton of power even before he was called up. He's made up for it by stealing three bases, as he continues to show off his game-changing speed. Bolte's base-stealing upside gives him a clear path to plenty of production in fantasy baseball. He's still available in 89% of fantasy baseball leagues, and he ranks as the #62 outfielder in RotoBaller's latest rankings for the 2026 season. Bolte represents a speed-centric waiver wire target as we approach the end of May.

From RotoBaller