The Phillies announced that they have acquired left-hander Kyle Backhus from the Diamondbacks. Minor league outfielder Avery Owusu-Asiedu goes in the other direction. The move opens a 40-man spot for Arizona, which should allow them to make their agreement with Merrill Kelly official. Philly’s 40-man count goes from 37 to 38.
Backhus debuted for the Diamondbacks this past season. The 27-year-old scuffled to a 4.62 ERA across 32 appearances. Arizona’s ever-changing mix of late-inning options allowed Backhus to factor into high-leverage situations, and he recorded a pair of saves and 10 holds. He notched a one-out save in his final appearance with the big-league club, coaxing a flyout with the bases loaded to finish off a 6-4 victory in mid-September. He was sent back to Triple-A Reno shortly after.
Arizona added Backhus as an undrafted free agent in 2021. After posting middling results in a half-season of professional ball, he began to gain traction as a backend reliever. Backhus posted a hefty 34.5% strikeout rate between High-A and Double-A in 2022, earning three saves at each level. He locked down 10 more saves at Double-A the following season, leading to a promotion to Triple-A. Injuries limited Backhus to 35 2/3 innings in 2024. He received an invite to Spring Training this year, and while he didn’t break camp with the club, a strong couple of months at Reno saw Backhus get the call to Arizona.
Backhus is a sinkerballer who doesn’t light up the radar gun, but comes from a unique slot. Statcast had his arm angle at nine degrees, which was among the lowest in the league. Backhus also ranked in the 96th percentile for extension. Interestingly, the low arm slot and sinker-heavy approach didn’t lead to many ground balls. Backhus had a below-average 37.8% ground ball rate. He did a decent job limiting hard hits, but gave up an elevated amount of contact in the air to the pull side.
The Backhus addition comes on the heels of a trade that sent fellow lefty Matt Strahm to Kansas City. Strahm led the Phillies with 22 holds in 2025. Jose Alvarado will likely step into the lefty setup role vacated by Strahm, with Tanner Banks on hand as a lower-leverage southpaw option. Backhus will serve as a depth option who could step in if injuries or poor performance afflict Philly’s bullpen.
Philadelphia took Owusu-Asiedu in the ninth round of the 2023 draft. He delivered nine home runs and 17 stolen bases at Single-A in 2024, but it came with a .192 batting average and a 36.1% strikeout rate. Owusu-Asiedu was able to trim his strikeout rate to 24% between Single-A and High-A this past season. He also racked up 33 steals in 107 games.
The 22-year-old Owusu-Asiedu has experience at all three outfield positions. He made at least six starts in left field, center field, right field, and DH with High-A Hillsboro.
