MILWAUKEE -- Ryder Jones is expected to miss the remainder of the season after dislocating his left patella Sunday during the Giants' 6-3 loss to the Brewers at Miller Park.
With regular first baseman Brandon Belt dealing with a sore knee, San Francisco manager Bruce Bochy gave Jones his second start of the season.
He struck out against Zach Davies his first time up, then, in the third, fell to the ground clutching his knee after fouling off a 1-0 pitch from Davies. He was tended to by the Giants' medical staff and able to walk off the field. 
Belt finished the at-bat, drawing a walk, and later scored the go-ahead run on Gregor Blanco's sacrifice fly. Belt stayed in the game, playing first base.
"It's a freak accident and it's a shame," Bochy said. "The kid gets a chance to play up here, takes a swing and does that. A tough break for him."
Bochy said Jones would undergo an MRI Monday when the team returns to San Francisco and is likely done for the season.
"I don't see him playing this year," Bochy said.
Ryder was one of several young players the Giants called up for the final weeks, not only to fill roster holes created by injuries, but also for the team to get a first-hand look at what each of them can offer as the Giants, out of playoff contention, shift their focus to 2019 and beyond.
Jones played 53 games for the Giants last season, but with Belt at first, he appeared in just one big league game this season before he was recalled on Sept. 4 after rosters expanded.
He made the most of his limited action. He put the Giants ahead with a solo home run off Edwin Jackson on July 20 and came up big again Saturday night with a pinch-hit, two-run shot off Joakim Soria as San Francisco tried to rally late in a 4-3 loss to the Brewers.
"Everybody here wants to be on the Opening Day roster next year," Jones said Saturday night. "You're just trying to go out and do what you can and show your ability, be aggressive and help the team."