PITTSBURGH -- The scuffling Philadelphia Phillies suffered a blow Saturday when they placed first baseman Bryce Harper on the 10-day injured list because of right wrist inflammation before their game against the Pirates.

Harper sat out Friday night's 5-4 loss to the Pirates, and the move is retroactive to Friday.

The two-time National League MVP and eight-time All-Star is hitting .258 with 9 home runs, 34 RBIs and 8 stolen bases in 57 games. He missed five games from May 26 to June 2 with a bruised right elbow after being hit by a pitch from Atlanta's Spencer Strider.

The Phillies are expected to play third baseman Alec Bohm at first while Harper is out, with utility player Edmundo Sosa taking over at third.

The Phillies have lost seven of their last eight games, going from leading the NL East by two games to trailing the New York Mets by 2½ games entering Saturday. Philadelphia had won 11 of 12 games before the skid.

Infielder/outfielder Otto Kemp's contract was purchased from Triple-A Lehigh Valley. The 25-year-old, who has yet to play in the majors, was hitting .317 with 14 homers, 55 RBIs and 11 steals in 57 games at Triple-A.

Kemp was the International League Player of the Month in April.

The Phillies also recalled right-hander Daniel Robert from Lehigh Valley and optioned righty Alan Rangel. Rangel, 27, made his major league debut Friday night, allowing two runs in three innings of relief.

This will be Robert's third stint of the season with the Phillies. The 30-year-old has given up one run in two-thirds of an inning over two games.