-- Phil Mickelson said he had a "brutal" Friday night and "didn't sleep at all" after his performance earlier in the day in pairing with Tiger Woods and losing both morning and afternoon matches for the U.S. Ryder Cup team.

"I felt like I let down not just my teammates but also all of the fans and everybody who is supporting the U.S. team," he said. "Boy, is it a miserable feeling."

Mickelson was feeling a bit better later Saturday afternoon, after he and David Toms combined in alternate-shot play to give the U.S. a 4-and-3 victory over Miguel Angel Jimenez and Thomas Levet. It was the only point posted in the afternoon by the Americans, who now must overcome an 11-5 deficit to win back the Cup.

Mickelson said he knows what was wrong Friday.

"We all approached it so intensely," he said. "We want to win this thing so bad. We are under constant scrutiny and ridicule. Yet we know we can play well when we fight. We fight it, and we don't play loose. We don't play upbeat. I was watching how I was walking down the fairway [Friday]. I wasn't smiling. I wasn't having the normal enjoyment I have when I played well at all the majors."

Mickelson also responded to the criticism he's received for switching clubs -- his driver, 3-wood and 4-wood, as well as his golf ball -- two weeks before this competition. He's now under contract to Callaway -- a 10-year, $80 million-plus deal -- after being given his release from long-time sponsor Titleist following the PGA Championship.

"I know that I made the right decision," he said. "Nobody else believes it, but I can live with that," Mickelson said. "If I went the other way and played with something that everybody else thought was right, but I didn't, that I can't live with. So it was a mistake I can live with. But it wasn't a mistake."

Woods Takes Blame

Tiger Woods blamed himself for missing two short putts early in his afternoon alternate-shot round, during which he and Davis Love III squandered an early 2-up lead and eventually lost, 4 and 3, to Padraig Harrington and Paul McGinley.

"I just did not play well this afternoon," Woods said. "I basically missed some putts, hit a couple of bad shots and basically put us in a very difficult position to try to win a match. . . . I played well in the first three matches, and this afternoon I just didn't have it. It was not a good time to have that happen."

Life of Riley

Chris Riley, the only man to get a half-point for the U.S. in Friday morning's best-ball session, earned a full point Saturday morning playing with his old Southern California pal, Woods. Their 4-and-3 victory over Ian Poulter and Darren Clarke also provided Woods his first point in the matches and left Riley totally exhausted.

Riley told American captain Hal Sutton that he preferred to sit out the afternoon alternate-shot session and get himself fresh enough to have a good showing in Sunday's singles.

"I've never played alternate shot," he said. "This is my first time in the Ryder Cup, and I'm pretty drained right now. So I told him I wasn't ready to go. We have tons of guys who will step up and play."

Riley, who became a father two weeks ago, will have another friend with him here Sunday. His wife, Michelle, was getting on a flight at 4 a.m. Sunday in Las Vegas and was scheduled to arrive here at 10:30 a.m., just in time to see her husband play.

Sitting out the morning matches, Phil Mickelson cheers on Jim Furyk and Chad Campbell. Mickelson and David Toms teamed up to win the Americans' only point in the afternoon.