Betancourt was feeling ill Friday afternoon and underwent an emergency appendectomy. He is expected to miss up to three weeks.
Betancourt is 2-3 with a 3.16 ERA and 15 saves in 16 chances.
NATIONALS: Davey Johnson will have to wait a while longer before he can restore his preferred pitching rotation.
The manager said Saturday that Ross Detwiler didn’t complete a full bullpen session and will miss at least two more starts while dealing with a lower back strain.
Tuesday against the Pittsburgh Pirates. Instead, rookie Double-A call-up Taylor Jordan (0-2) will remain with the club and hold Detwiler’s spot. Washington will also need a fill-in starter for Friday’s doubleheader against the New York Mets.
RED SOX: Activated shortstop Stephen Drew from the disabled list and optioned third baseman Brock Holt to Triple-A Pawtucket on Saturday before a game against the New York Yankees.
Drew, hitting .233 with five homers and 31 RBIs, missed 16 games because of a strained right hamstring.
CARDINALS: Placed outfielder Matt Holliday on the 15-day disabled list with a strained right hamstring.
The move was made retroactive to July 12 for the Cardinals’ No. 3, who had missed four games after getting hurt running to first on July 11 at Chicago. The team purchased the contract of first baseman/outfielder Brock Peterson, a Pacific Coast League All-Star at Triple-A Memphis.