Mike Hampton joined Paul Byrd on the disabled list Saturday, another blow to the Atlanta Braves’ starting rotation heading into the start of the season.

Hampton strained his right calf during a workout on a treadmill Friday night and Byrd has a sore elbow. That leaves the Braves to open with a rotation of Greg Maddux, Russ Ortiz, rookie Horacio Ramirez and Jason Marquis.

“I feel terrible because I want to get in here right away and get off to a good start and help this team,” Hampton said. “That’s kind of a wash now.”

Hampton, who expects to be sidelined until mid-April, said he was 17 minutes into a 20-minute routine on the treadmill when he felt a sharp pain in his right calf.

“I knew exactly what it was when I did it,” he said, adding he had the same injury two years ago before his first season with the Colorado Rockies.

Braves manager Bobby Cox will use a four-man rotation for the first week or so, hoping Byrd will be available by April 10. Byrd is eligible to come off the DL on April 5, Hampton on April 12.

“We’ve got it covered. We’ll be all right,” Cox said.

Also Saturday, the Cincinnati Reds announced former President Bush will fill in for his son and throw out the ceremonial first pitch Monday for the Reds’ season opener.

The Reds invited the current president to officially open Great American Ball Park by throwing a pitch before the opener against the Pittsburgh Pirates. Chief operating officer John Allen said Saturday that the White House gave no reason for the switch.

Bush was invited before the invasion of Iraq, and the White House had delayed making a commitment to the game.

In exhibition games:

Yankees 4, Phillies 3

Todd Zeile hit a go-ahead, two-run single in the seventh, and Jeff Weaver allowed three runs, four hits and struck out three in four innings. David Wells followed and gave up one hit over three scoreless innings.

Devil Rays 12, Blue Jays 12

Toronto’s Tanyon Sturtze allowed nine runs and 12 hits in four innings against his former team. Tampa Bay starter Nick Bierbrodt gave up eight runs and seven hits in three innings.

Pirates 8, Tigers 3

Josh Fogg became the first Pittsburgh pitcher since 1996 to win five games in spring training, Pittsburgh’s Randall Simon extended his hitting streak to 14 games and minor leaguer Nate McLouth homered and tripled.

Red Sox 2, Braves 1

Shea Hillenbrand drove in two runs and John Burkett allowed one run and two hits in five innings.

Orioles 7, Mets 3

Jay Gibbons, Jerry Hairston, Gary Matthews Jr. and Melvin Mora homered for Baltimore, and Mike Piazza hit a two-run shot off Orioles starter Pat Hentgen.

Indians 3, Reds 1

Brian Anderson wore short sleeves and gave up three hits in five innings, including Austin Kearns’ RBI single in the first inning. It was the second exhibition game at the Great American Ball Park, which officially opens Monday.

Twins 4, Brewers 0

Torii Hunter, Doug Mientkewicz and Denny Hocking homered off Matt Kinney, who was 0-3 this spring.

Cubs 4, Diamondbacks 2

Sammy Sosa, who needs one regular-season home run to reach 500, wrapped up his spring by going 2-for-3 with a homer and two RBIs. Mark Prior allowed two runs — one earned — and two hits in six innings with seven strikeouts.

Giants 8, Athletics 4

Barry Bonds hit a two-run homer off Mark Mulder for his team-record 10th home run of the spring. Giants closer Robb Nen worked one inning in his first action against major league hitters since having offseason shoulder surgery.

Rangers 6, Mariners 5

Rafael Palmeiro homered and drove in two runs for Texas.