Rory McIlroy faces a hectic weekend as he plans to be ringside at Floyd Mayweather's superfight against Manny Pacquiao while also bidding for success in the WGC Matchplay in San Francisco.
Group matches will be played today, tomorrow and Friday and the winner of each group advances to the last 16 on Saturday morning, with the quarter-finals that afternoon.
The semi-finals are on Sunday morning with the final and consolation match later that day.
That could mean a very busy weekend for top seed McIlroy, who plans to attend the big fight in Las Vegas on Saturday night, having possibly played 36 holes - or more - earlier that day, with the prospect of the same to come on Sunday.
There is, of course, no guarantee the Ulsterman will get that far, especially as the world number one finds himself in a group with FedEx Cup winner Billy Horschel, former US PGA champion Jason Dufner and Brandt Snedeker.
Only Tiger Woods has won the tournament as the number one seed - in 2003, 2004 and 2008.
Australia's Jason Day is the defending champion, having beaten Victor Dubuisson in last year's final, and will be looking to improve on his 14-3 record.