That's the question facing three teams currently holding down playoff spots. All three lost key players to the disabled list over the weekend, and the two National League clubs may be most affected by those injuries. The Cincinnati Reds, who hold a one-game edge over Arizona in the wild-card race and trail St. Louis by 2.5 games in the NL Central, put closer Eddie Guardado on the DL Sunday with elbow tendinitis. The veteran lefty was one of a number of relievers acquired to bolster a terrible Reds bullpen, and he's been the best of the new arrivals. Guardado has converted eight of 10 save chances while posting a 1.29 ERA and fanning 17 in 14 innings. Second-year right-hander Todd Coffey, who had a 5.73 ERA through June and July but has recovered nicely in 13 August appearances, is one option. Another is rookie southpaw Bill Bray, a trade pickup from Washington who was a key contributor in July but has a 5.59 ERA in nine games this month. The New York Mets could lose Tom Glavine, possibly for the rest of the season after the 12-game winner felt coldness in his left ring finger after his start last week in Philadelphia. He will be examined for a blood clot, and if one is found and surgery is required, Glavine's season is over. The Mets already are without Pedro Martinez, who has a calf strain that will keep him out into September. Still, the Mets are all but certain of claiming the NL East crown, but losing Glavine could compromise their chances in the playoffs. Over in the American League, Oakland placed closer Huston Street on the DL Sunday with a groin strain. He was injured Friday, when the A's were beaten twice in a doubleheader with Kansas City. Despite the two losses, the A's have won 18 of 23 games since July 26 to take a 4.5-game bulge over the Angels in the AL West. They will attempt to maintain their lead while calling on the rest of a solid bullpen to pick up the slack. Street may be missed less than Guardado will be in Cincinnati. Yet, losing a key player in the heat of a pennant race becomes another factor in a team's chances.