Looking for candidates to go below 63 at Merion? You could do worse than this trio
Can holster fickle driver and dissect course with his precise iron play (see Hoylake, 2007, and the Players, last month). Putting stroke is as good as ever.
Leads Tour in driving accuracy and scrambling. Can get streaky hot with irons, is very good putter and excels on U.S. Open setups.
Birdie machine who's considered game's best putter. Not afraid to go low—shot combined 43 under par during two-week February run at Pebble Beach and Phoenix.