Kansas City Royals reliever Lucas Erceg has converted both save opportunities while posting a 1.13 WHIP and one strikeout across 2 2/3 scoreless innings in 2026. The Royals placed closer Carlos Estevez (foot) on the 15-day injured list with a foot contusion. Estevez had velocity concerns heading into the year and was lit up for six earned runs in only one appearance this season. With Estevez on the injured list, Erceg has locked down Kansas City's closer role and becomes a must-add off the waiver wire for fantasy managers searching for saves. The 30-year-old was terrific last season, owning a 2.64 ERA, 1.17 WHIP, and 48:18 K :BB with two saves and 23 holds over 61 1/3 innings for the Royals last season. Erceg is rostered in 51% of Yahoo Fantasy leagues and is currently third on RotoBaller's Week 2 waiver wire rankings.

Seattle Mariners top shortstop prospect Colt Emerson (foot) exited Game 1 of Saturday's doubleheader at Triple-A Tacoma after fouling a ball off his right foot. He stayed in the game initially, but was replaced in the next half inning. Emerson will go under further evaluation to determine the extent of the injury and is considered day-to-day for now. The 20-year-old signed an eight-year, $95 million extension with the Mariners on Tuesday and is expected to be promoted to the big leagues soon. However, if he misses any significant time, the injury could delay his call-up to the show. Despite Emerson signing a long extension, J.P. Crawford will remain Seattle's starting shortstop for the time being. Fantasy managers should continue to stash Emerson due to his high upside and above-average power.

Milwaukee Brewers outfielder Sal Frelick (side) exited Game 2 of Saturday's doubleheader against the Kansas City Royals with left side tightness. He went 1-for-2 with a strikeout before exiting the fourth inning. The 25-year-old went 2-for-5 with a walk, a strikeout, and a run in both games of Saturday's doubleheader. He is considered day-to-day for now and will undergo further testing to determine the severity of his injury. Frelick is off to a slow start, slashing just .192/.344/.346 with a home run and two RBI across eight games. Brandon Lockridge replaced Frelick on Saturday and would see an increase in playing time with Frelick sidelined. Lockridge is a speculative add in deep leagues after hitting .400 (6-for-15) with a double over five games in 2026.

Los Angeles Dodgers shortstop Mookie Betts (back) will undergo an MRI on his back on Saturday and is considered day-to-day for now. Betts exited Saturday's game early against the Washington Nationals in the first inning with lower back pain and will undergo further evaluation to determine the severity of the injury. The 33-year-old walked and scored a run before leaving Saturday's contest. "Betts felt his back tighten up while running the bases in the first inning," Dodgers manager Dave Roberts said. Roberts described Betts' injury as "more moderate than serious," but does not expect Betts to play the next couple of days. He is off to somewhat of a slow start this season, slashing .179/.281/.429 with two home runs, seven RBI, and seven runs over eight games. Miguel Rojas should see an increase in at-bats with Betts out and is worth using as a streamer in deep leagues for fantasy managers searching for an injury replacement.