SCOTTSDALE, Ariz. -- After experiencing an almost idyllic Spring Training that was mostly devoid of controversy or adversity, the Giants suddenly must confront injuries to three key performers who could be sidelined for prolonged periods.
Left-hander Will Smith, considered potentially the top setup reliever for closer Mark Melancon, has both a sprain and a strain in his throwing elbow that may require surgery.
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First baseman/outfielder Michael Morse, who was cheerfully overcoming the odds against him as he tried to make the Opening Day squad as a non-roster player, injured his left hamstring while rounding first base Monday and will be shelved for at least two weeks, Giants manager Bruce Bochy said.
Outfielder Mac Williamson, who was competing with Jarrett Parker for the left-field vacancy, also is expected to miss at least two weeks as his injured left quadriceps heals.
Smith's health is a primary concern, given the possibility of surgery and his unique position on the club. The Giants' mostly young and relatively inexperienced bullpen has no obvious candidates to perform setup duties besides Smith, a five-year veteran.

Smith, who was sidelined with inflammation in his left elbow earlier in Spring Training, interrupted what was only his second Cactus League appearance Monday against the White Sox when he felt discomfort and walked off the mound. Bochy pointed out that a re-injured area typically requires more recovery time than usual. The Giants' medical staff continued to examine Smith on Tuesday.
"I see [Smith] being down for a little while, but it's hard to say exactly how long until I find out what's going on," Bochy said.
Smith's misfortune alters the Giants' left-handed landscape. Rookie Steven Okert, who has not yielded an earned run in six appearances, almost certainly will make the team. The same goes for Josh Osich (despite his 7.11 ERA). Ty Blach, a contender for the No. 5 starter's spot, could be tried in relief. Blach's 5.02 ERA is deceiving, particularly given his 11-1 strikeout-to-walk ratio. Bochy also mentioned Michael Roth, a non-roster invitee who has big league experience with the Angels (2013-14) and Rangers (2016).
Morse, meanwhile, was batting just .258 but had compiled an .859 slugging percentage. The Giants envisioned him as a much-needed source of power off the bench and as a right-handed-hitting complement to Parker, the left-handed hitter who's likely to be San Francisco's primary left fielder.
Asked whether he'd consider trying to play himself back into game shape at Triple-A Sacramento after rehabilitating his injury, Morse told reporters he's not sure. "I don't know. I don't want to think about that yet," said Morse. "If it gets to that point, I'll think about it, but right now it's [about] how I feel every day. I don't want to get ahead of myself."
Morse's likely stretch of inactivity widens the opening for other non-roster position players seeking bench roles, such as Aaron Hill, Jae-gyun Hwang and Chris Marrero.
Williamson, who hasn't played since last Wednesday, is batting .324 with two home runs. Only recently has the Giants' staff begun to comprehend the severity of his injury.
"Mac's a little ways away," Bochy said. "He did a pretty good job with that quad."
By "pretty good," Bochy meant that Williamson is hurt pretty badly, which has dampened some of the enthusiasm of the Giants' spring.