LONDON — The world golf ranking does not have Vijay Singh among the top 50 for the first time in nearly 18 years.

Singh slipped to No. 51 in the world ranking published Monday after he failed to qualify for the final 36 holes at the Texas Open. It was his fifth consecutive tournament without earning ranking points.

The last time Singh was ranked out of the top 50 was Aug. 16, 1992. He won the German Open the next week and has been in the top 50 every week since. Singh is the only other player besides Tiger Woods to be No. 1 in the world during the last decade, reaching the top for the first time in 2004.

The timing could not have been worse. Singh has one week to get back into the top 50 or he will have to qualify for the U.S. Open.