Guerra (hamstring) returned to the Nationals as a non-roster invitee Monday, Jesse Dougherty of The Washington Post reports. The 35-year-old threw 15.2 innings last season before his campaign was cut short by a hamstring strain. It's unclear whether or not the issue will carry over into spring training. Guerra owns a 3.73 ERA in 296.2 career innings of relief, though his 4.84 mark over the last three seasons is considerably less impressive.
Guerra (hamstring) cleared waivers Monday and elected free agency, Jessica Camerato of MLB.com reports. The veteran exercised his right to refuse an outright assignment to the minors and will try his luck on the open market instead. Whether or not the 34-year-old's 4.84 ERA over the last three seasons is enough to earn him a major-league deal this winter remains to be seen. His decent 4.02 ERA in 15.2 innings this season, a campaign which was cut short by a hamstring strain, came with a 1.66 WHIP.
Guerra was placed on the 10-day injured list Wednesday with a left hamstring strain, Mark Zuckerman of MASNSports.com reports. The 34-year-old sustained the injury during Tuesday's contest as he delivered 14 of his 30 pitches for strikes over 1.2 scoreless innings. Guerra will be eligible to be activated Sept. 12, but it's unclear when he's expected to return from the injured list.
Manager Dave Martinez said Guerra's hamstring "grabbed him pretty good" during his appearance Tuesday against the Phillies, Mark Zuckerman of MASNSports.com reports. Martinez indicated the injury occurred on the right-hander's final pitch, but he struggled with his control throughout the appearance, throwing only 14 of his 30 pitches for strikes. He had two strikeouts and three walks over 1.2 scoreless innings without giving up a hit. Guerra wasn't provided a timeline for his return and should be considered day-to-day until he undergoes further evaluation.
Guerra allowed two hits and struck out two in a scoreless eighth inning Tuesday to record his second hold of the season in a win over the Mets. Sean Doolittle has had a rough start to the year and Will Harris (groin) is still on the shelf, so manager Dave Martinez has had to get creative with his setup crew in front of Daniel Hudson. Guerra has stepped up in their place, posting a 1.93 ERA, 0.64 WHIP and 4:0 K:BB through 4.2 innings over three appearances. If he continues pitching well, he could remain in a high-leverage role even after the Nats bullpen is back at full strength.