Phil Mickelson will compete in the EDS Byron Nelson Championship on Thursday despite missing Wednesday's pre-tournament pro-am.

PGA Tour rules state that a player missing a pro-am is automatically disqualified from the tournament, except for "extenuating circumstances".

Mickelson had planned to fly into town in his private jet late Tuesday night from nearby Little Rock, Arkansas, roughly a one-hour flight, in time for his 7am pro-am tee time, but the Dallas Love Field airport was closed due to severe thunderstorms.

Instead, he spent the night in Little Rock, arriving here at TPC Four Seasons resort shortly after 11am on Wednesday. Mickelson, it seems, was happy to play an afternoon pro-am, but the tour decided not to rearrange the tee times. Instead, he had lunch with the amateurs he was supposed to have played with.

"Phil was prepared to play in the afternoon. It wasn't his decision not to play," said Mickelson spokesman TR Reinman.

The PGA Tour's decision to allow Mickelson to play in the tournament was greeted with cynicism by some fellow players, who accused the tour of having a double standard, recalling that Retief Goosen was disqualified from the 2005 Nissan Open for missing his pro-am tee time, after oversleeping.

But the tour issued a statement defending its decision.

"Phil did everything physically possible to get here Tuesday night, but was grounded in Little Rock due to circumstances completely beyond his control," said tour executive vice president Henry Hughes.

Eight-time PGA Tour winner Stuart Appleby said the appropriate question was whether Mickelson had made every effort to get into town in time for the pro-am.

"I'm sure a lot of players think it's a very dodgy decision," said Appleby, who was curious to know whether Mickelson could have arrived at the crack of dawn in time to play.

"Each situation has to be looked at independently. If a player makes a reasonable effort, he gets a pass. If he doesn't, he should be disqualified. I don't care who you are.

"If the (Dallas) airport was open in the early hours this morning, what I would say to my pilot is 'I've got to be in Dallas at 5.30am. If it's open, call me and wake me up."

Appleby knows the sponsors are no doubt thrilled that Mickelson was not disqualified, considering he is easily the biggest draw in a thin field that includes only one other world top-10 player, Vijay Singh.

Mickelson's appearance has been greeted locally as a silver lining in the absence of Tiger Woods, whose decision to skip the tournament, seven months after Nelson's death, has left a sour taste.

Woods played here eight times in the previous 10 years, missing the event in 2003, when it clashed with an overseas appearance, and last year, when it fell just days before his father died.

Officials hoped Woods, who has made no secret that he does not like the course, would return one more time to honour Nelson, but it wasn't to be.

"The ultimate reason for players to play is they've got to feel comfortable with the course, and they've got to feel like they are going to be successful," said Luke Donald.

"No disrespect to Mr Nelson. I'm sure they respect him as a person and someone who's done a lot for golf, but if they feel they're not going to be competitive or successful around a place, then they won't come."

Donald said he came because he liked the course: "I've had a lot of success here. I play well around here and I feel I've got a good chance to win, so that's my main reason for being here."