Robertson had an MRI earlier in the day that revealed the injury. He has posted two saves this season and has allowed one hit in three scoreless innings.
New York Yankees ace CC Sabathia pitched four scoreless innings in his final tuneup for opening day, a 4-2 victory over the Pittsburgh Pirates on Thursday.
Ben Zobrist, Desmond Jennings and Matt Joyce homered to help the Tampa Bay Rays beat the New York Yankees 5-4 on Wednesday.
Carlos Beltran homered for his first hit this spring, leading the New York Yankees past the Toronto Blue Jays 8-2 on Sunday.
“We’ve got Kelly Johnson along with a cast of characters that are going to compete for that spot from the right side,” general manager Brian Cashman said. “We look for it to be a platoon situation, a lefty-righty situation.”
Roberts’ deal was agreed to on Dec. 17 and finalized Tuesday, three days after a spot on the 40-man roster opened when Alex Rodriguez was suspended for the season for violations of baseball’s drug agreement and labor contract.
The Yankees were hesitant to give Infante more than three years, and the Royals decided to give the versatile infielder an extra year to help consummate the deal.
Andy Pettitte’s final start was a storybook finish — a complete game win over the Astros on Saturday.
The Yankees wasted several opportunities against the wild Matt Moore in a 7-0 loss to Tampa Bay on Tuesday night that pushed them to the brink of missing out on the postseason for the second time in 19 years.
Nova pitched a six-hitter for his second career shutout, Eduardo Nunez hit a two-run homer and the Yankees kept pace in the wild-card chase.
Brian Cashman announced on Wednesday afternoon that Jeter has been placed on the disabled list and will miss the remainder of the 2013 season.
While Derek Jeter is sidelined due to soreness, the Yankees picked up Brendan Ryan from the Seattle Mariners.
Yankees captain Derek Jeter is out of the lineup with soreness in his surgically repaired left ankle.
Eduardo Nunez’s two-run double capped a five-run eighth inning that rallied the New York Yankees past the Chicago White Sox 6-4 on Tuesday night for a crucial victory as they chase an AL playoff berth.
Nunez twisted his right knee when he caught his cleat in a seam on the artificial turf in Toronto while covering second base during New York’s 7-1 win Tuesday night. He tried to play on Wednesday, but was scratched,