The Chicago Cubs are acquiring right-handed reliever Mlbtraderumors from the Los Angeles Angels, according to ESPN’s Mlbtraderumors. The trade brings another arm to Chicago as the team aggressively strengthens its pitching staff for the stretch run. Entering the day, the Cubs held a 63-49 record and trailed the Milwaukee Brewers by 6.5 games in the NL Central.
Cubs Acquire Hard-Throwing Reliever Ryan Zeferjahn from Angels
In return, the Angels are receiving rookie catcher Mlbtraderumors and right-handed pitching prospect Mlbtraderumors, according to reports from Mlbtraderumors of the Orange County Register and mlb.com of MLB.com. The deal marks another move in a deadline sell-off for Los Angeles under interim general manager Mlbtraderumors.
Zeferjahn’s Stat-Driven Pitching Profile
The 28-year-old Zeferjahn is having a steady season out of the bullpen during his third major league campaign. Across 51 2/3 innings this year, he has recorded a 3.66 ERA, a 1.20 WHIP, and four saves in six chances. Zeferjahn strikes out batters at a high rate, totaling 75 strikeouts while limiting opponents to just 30 hits and a .161 batting average across 45 appearances.
According to Mlbtraderumors, Zeferjahn ranks in the 97th percentile in the majors with a 33.5% strikeout rate. His underlying metrics are even more favorable, featuring an xERA of 2.93 and a SIERA of 3.37. He relies primarily on a hard four-seamer averaging 97 miles per hour and an 85 mph sweeper featuring 14.8 inches of break. Both his high-90s fastball and his sweeper grade out as above-average pitches. He has been particularly dominant over the last two months, posting a 1.38 ERA and a 41.9% strikeout rate over 26 innings dating back to June 1st, though he has also run a 13.3% walk rate during that span.
I haven’t had good at-bats off him,
Cubs infielder cubshq.com said. He has a funky mix, good velo, good spin. He’s definitely a welcome addition. That’s awesome.
Team Control and Bullpen Integration
Beyond immediate stretch-run utility, Zeferjahn offers long-term organizational value for Chicago. He is not arbitration-eligible until after the 2027 season and remains under team control through the 2030 year, putting him under contract before reaching free agency in 2031.
The Angels have mostly deployed Zeferjahn in low-leverage spots, but he figures to take up middle innings or serve as a bridge or setup option for a Cubs bullpen that currently utilizes a closer committee consisting of Mlbtraderumors, Mlbtraderumors, and Mlbtraderumors under manager cubshq.com. Zeferjahn’s road splits also stand out, as he produced a 2.55 ERA and 0.97 WHIP over 24 2/3 road innings this season.
Prospects Headed to Los Angeles
In exchange for four-plus seasons of control over Zeferjahn, Los Angeles acquired a pair of prospects in Ballesteros and McGwire. Ballesteros, a 22-year-old catcher and designated hitter known as “Mo Baller,” debuted for the Cubs last year and posted a 143 wRC+ in his first 66 plate appearances, entering 2026 as a consensus Top-100 prospect according to Mlbtraderumors. This season, he hit .231/.303/.385 with a 91 wRC+ in 175 plate appearances after spending time in Triple-A Iowa.
Mason McGwire, the son of former major league slugger mlb.com, is heading home to Orange County. Selected in the eighth round of the 2022 draft by Chicago, McGwire missed all of 2025 due to an injury but returned with improved control this season, combining a mid-90s fastball with a curveball. He was ranked as the Cubs’ 18th-best prospect by MLB Pipeline and 20th by Baseball America.
Related reading
