Lee Westwood has missed the cut at the Qatar Masters, opening the door for Martin Kaymer to replace him at the top of the rankings.

Westwood shot a 3-over 75 Friday, a day after shooting a 73 in the wind. The Englishman's struggles in Qatar follows a 64th-place finish in last month's European Tour event in Abu Dhabi.

Westwood replaced Tiger Woods at the top of the rankings in October. Kaymer could advance from No. 2 to No. 1 with a second-place finish. He is 10 shots back.

Westwood attributed his poor showing in Qatar to "early-season rust." He expects to improve at next week's Dubai Desert Classic because the course suits him better.