Giants deal Arraez, Kilian to Phillies for two righty prospects

ARLINGTON -- The Giants kicked off Monday’s Trade Deadline by cashing in their biggest trade chip, finalizing a trade that sends All-Star second baseman Luis Arraez to the Phillies along with right-handed reliever Caleb Kilian.

San Francisco received right-handed pitching prospects Ramon Marquez and Marty Gair from the Phillies in exchange.

TRADE DETAILS
Phillies receive: INF Luis Arraez, RHP Caleb Kilian
Giants receive: RHP Ramon Marquez (PHI's No. 4 prospect), RHP Marty Gair (High-A reliever)

Marquez, 20, was ranked the Phillies’ No. 4 prospect per MLB Pipeline and has a 1.68 ERA with 93 strikeouts over 59 innings in 12 appearances (11 starts) between Single-A Clearwater and High-A Jersey Shore this year.

Gair, 23, was a 13th-round Draft pick of the Phillies in 2023 and recorded a 4.50 ERA over 30 relief appearances between Single-A Clearwater and High-A Jersey Shore in 2026.

The additions of Marquez and Gair should help boost a Giants farm system that has been short on pitching depth this year. The club also addressed its need for more frontline arms by taking a trio of young hurlers -- right-hander Jackson Flora (No. 4 overall), left-hander Carson Boleman (No. 29) and right-hander Kaden Waechter (No. 55) -- with its first three picks of the 2026 MLB Draft.

Arraez, 29, joined the Giants on a one-year, $12 million deal over the offseason and quickly emerged as their most valuable position player, batting .324 with an .800 OPS, four home runs and 43 RBIs over 105 games while earning his fourth career All-Star nod. The contact savant ranks second in the Majors in batting average, trailing only the Astros' Yordan Alvarez, and has an MLB-low 4.5% strikeout rate in 2026.

That type of production has become the norm for the three-time batting champion, but Arraez has managed to pair his steady offense with significantly improved defense at second base. He had previously been viewed as a defensive liability at his natural position, prompting the Padres to relegate him to first base/designated hitter duties over the last two seasons.

Arraez received multiyear offers from other teams over the winter, but he decided to take the one-year contract from the Giants because they were willing to give him a chance to return to second base this year. He focused on improving his defense with his personal trainer, Rainer Olmedo, in Miami over the offseason and kept that work going in San Francisco under Ron Washington, the renowned infield guru who was added to the Giants’ coaching staff this year. His efforts have paid off, as Arraez has tallied +10 Outs Above Average at second base, tied for the ninth-best at any position in the Majors in 2026.

By landing with another National League team, Arraez will have a chance to compete for his fourth career batting title, though he remains locked in a tight battle with the Marlins’ Otto Lopez, who ranks second in the Senior Circuit with a .321 average.

Casey Schmitt had been in line to replace Arraez as the Giants’ starting second baseman, but he underwent surgery to repair a torn meniscus in his left knee on Friday and is likely to miss the rest of the season. With Schmitt and Arraez unavailable, the Giants could lean on the likes of Osleivis Basabe, Nate Furman and Christian Koss to fill in at second over the final two months of the regular season.

Kilian, 29, was selected by the Giants in the eighth round of the 2019 Draft before he was sent to the Cubs as part of the Kris Bryant trade in 2021. He returned to the organization on a Minor League deal over the offseason and won a spot in the Opening Day bullpen as a non-roster invitee.

The Giants named him their closer in June, though he’d been inconsistent at times, logging a 4.26 ERA over 45 appearances this year.