The American pair were both sitting at 20 under through 14 holes when darkness saw play suspended in Playa del Carmen on Sunday. Dahmen, who began the day tied for 31st, rocketed up the leaderboard and now is tied for sixth at 15-under 269 before the rest of the field completes the tournament. Harris English, the 36-hole leader, also was tied until he dropped a shot on the 17th. A victory would get him into the Masters and the U.S. Open.
With no margin for error, he made par on the last two holes. Johnson joined the group in front so he could finish.
"I still have a chance", Ortiz said.
Brendon Todd extended his winning streak to a second successive PGA title with victory at the Mayakoba Classic on Monday.
Thursday's first round was washed out entirely, but Todd's excellent play from earlier in the month resumed when the contest did on Friday, posting an opening eight-under 63 to end just one stroke behind Danny Lee.
Todd holed an 18-foot birdie putt on the 15th hole and looked to stretch his lead to two shots until he missed a 3-foot par putt on the 16th.
Taylor saved par from about 5 feet on the 15th hole when he returned in the morning. On the next hole, Todd's approach caught enough of a slight ridge to roll off the side into a tough lie in the Bermuda rough. The best he could manage was 10 feet, and his par putt turned away.
English made his second straight birdie to pull within one shot.
"This win might honestly mean more to me than the last one, this being a full FedEx Cup event, full $7.2 million purse and a resort that I just love".
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