Scotland’s Martin Laird is two shots off the lead at the Farmers Open as Jason Day, Phil Mickelson and Justin Rose miss the cut.
Winning the FA Cup could buy time for Louis van Gaal to succeed at Manchester United, says former England striker Alan Shearer.
Van Gaal, 64, has faced criticism as United have struggled in the Premier League and failed to reach the Champions League knockout stage.
But his side reached the FA Cup fifth round with a 3-1 win at Derby.
“When Arsenal won the FA Cup it kept them going and gave Arsene Wenger a bit of time,” said Shearer.
Arsenal manager Wenger was heavily criticised by some Gunners supporters before ending a nine-year trophy drought by winning the 2014 FA Cup.
The Frenchman admitted in the build-up to the following season that success had “lifted the pressure”, with his team going on to retain the trophy by beating Aston Villa at Wembley last May.
Wenger’s team are now challenging for the Premier League title, and BBC Sport analyst Shearer believes winning the FA Cup could also have a positive effect for both Van Gaal and United.
“Without this competition you could imagine the calls that Wenger would be having to answer,” said Shearer, 45. “It’s a similar situation now for Manchester United.”
‘Season would have been over with Derby defeat’
The Red Devils are fifth in the Premier League, five points adrift of fourth-placed Tottenham as they aim to secure Champions League qualification for next season.
Van Gaal’s side were eliminated after the group phase of Europe’s premier club competition this season, dropping into the Europa League.
And former United goalkeeper Peter Schmeichel said the FA Cup is their only hope of salvaging an unsatisfactory season.
“If they had lost at Derby the season would have been finished,” said the 52-year-old Dane, who watched the game as a BBC Sport summariser.
“I can’t remember any point in Manchester United’s history when the season has been finished in January.”
Van Gaal targets FA Cup success
Van Gaal is aiming to lead United to a record-equalling 12th FA Cup success, but says the competition does not hold any more importance to him than either the Premier League or Europa League.
The Red Devils have not won the FA Cup since beating Millwall in the 2004 final under Sir Alex Ferguson, while no player in the current squad has an FA Cup winner’s medal.
“The Premier League is important and the FA Cup also because it is the greatest cup in English history,” said Van Gaal.
“We haven’t won it for a long time. We dream of it but after two wins you cannot say we shall win the trophy because a lot of clubs want to win it.
“I want to win it but I want to win every match. There’s no question of that.”