Matt Jones closed with 66 at the Golf Club of Houston, then holed a chip shot on the first playoff hole.
The 54-hole leaders are now just 9-for-20 this season, and only 26 of 58 (44.8 percent) since the start of 2013.
And these aren’t just unproven players who are faltering down the stretch.
Kuchar, in particular, has struggled to close out his past four tournaments, failing to break par in each final round. Last Sunday, he shot 75 to squander a chance to win the Valero Texas Open.