Illness forces Danny Willett out of Arnold Palmer Invitational
Willett was due to tee off at 8:11am local time at Bay Hill, but pulled out due to illness and was replaced in the field by American Blayne Barber.
The world number 14 will now have just one tournament, next week's WGC-Dell Technologies Match Play in Texas, to find some form ahead of the year's first major championship.
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Hide AdWillett was fifth in the Maybank Championship in February after failing to convert a three-shot 54-hole lead, but then missed the cut in the Honda Classic and was 69th in a 77-man field in the WGC-Mexico Championship.
The 29-year-old wrote on Twitter: "Really sad to have to withdraw from the @APinv I've been up all night with terrible sickness.. Not ideal but felt it worse to take a spot from the first reserve if I wasn't able to finish.. come Sunday im sure there'll be great champ once again."
This week's event is the first since Palmer's death last year. The seven-time major winner, who died at the age of 87 in September, started the event which bears his name in 1979 after buying Bay Hill Club and Lodge four years earlier.
A 14-foot bronze statue of Palmer was unveiled at the course on Saturday, while Willett was among the players who had the tournament's "umbrella" logo on their bags for the week.