Either Tiger Woods or Rory McIlroy are expected to capture a Masters championship next month at Augusta.
The American legend had high praise for Rory McIlroy, who has struggled to go deep in major tournaments in recent months.
The Northern Irishman has been rebounded from some recent lackluster efforts.
Rory McIlroy downplayed rumors that he broke up with longtime girlfriend Caroline Wozniacki, despite reports that the couple had ended their relationship.
The 36-year-old finished 10-under par to win his first major.
The Northern Irishman shot a 71 on Friday to climb back into contention.
Tiger Woods struggled after the turn during the first round and finds himself tied for 47th in the final major of the year.
Most players would be thrilled to be atop the money list and the Fed Ex Cup standings, but Tiger Woods has far more lofty goals to fulfill beginning Thursday in the first round of the PGA Championship.
Tiger Woods, Phil Mickelson and Rory McIlroy are among the favorites to win the 2013 PGA Championship.
The Northern Irishman finished tied for 27th at Firestone, as the PGA Championship looms.
Spain's Miguel Jimenez is the leader after two rounds, but Tiger is only one stroke back heading into the weekend at Muirfield.
Zach Johnson will take a narrow lead into the Open second round, but Tiger Woods is handily placed.
Tiger Woods, Phil Mickelson and Justin Rose lead the betting odds for the 2013 British Open.
An elbow injury has kept Tiger Woods out of action for almost a month, but the American is still favored to win The Open next week.
Rory McIlroy found the water on the 11th hole at Merion Golf Club and took out his frustration on his wedge, eventually making a quadruple-bogey on the par-4.
The American is just ahead of Hunter Mahan, Charl Schwartzel, and Steve Stricker.
Weather has made for high scores across the board at the 113th U.S. Open.
The American is please with his play but not with the results at the 2013 U.S. Open
The U.S. Open continued Friday after rain and thunder storms cut the first round short.
Heavy rains are expected throughout the day, and it is unclear when play will start again at Merion GC.
Tiger Woods, Phil Mickelson and Matt Kuchar have the best betting odds to win the 2013 U.S. Open.
A three-way tie at the TPC Sawgrass may go down to the wire Sunday.