Pittsburgh, PA (Sports Network) - Mark Calcavecchia fired a 6-under 64 on Saturday to grab a share of first place after three rounds of the Senior Players Championship.

Calcavecchia, who won last week's Montreal Championship, moved to 12-under 198 at Fox Chapel Golf Club. He is joined in first place by Joe Daley, who is coming off a tie for fourth at the Senior PGA Championship and shot a 2-under 68 on Saturday.

"The last group's the best place to be," Calcavecchia said during a television interview. "Everybody's in front of you, you know what you need to do."

Defending champion Fred Couples had led at the start of the third round, but slipped into a share of third after managing a round of even-par 70, while battling a sore back.

"My back's killing me," Couples said in a TV interview. "I just really couldn't hit the ball."

Couples stayed at minus-11 and shares third with Tradition winner Tom Lehman, who carded a 4-under 66.

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