Penn State had won three of four to trim Iowa's lead to 15-12 before Telford stepped on the mat. He forced a stalling call in the second period for a 1-0 lead, escaped in the third to make it 2-0 and added 1:55 of riding time to earn his eighth win of the season against a ranked opponent.
Iowa lead 12-3 before the break, getting wins at 125, 141, 149 and 157 pounds.
Penn State won decisions at 165 and 174 after the break to trim Iowa's lead to 12-9 before Sammy Brooks extended the Iowa lead to 15-9 with a 7-1 win at 184.
Morgan McIntosh pulled Penn State back within striking distance with a 7-1 win against Nathan Burak at 197 when Telford stepped up and handed Lawson his first loss in 12 matches this season.
Iowa clinched at least a share of the Big Ten Conference regular season crown for the seventh time in eight seasons. The Hawkeyes can win the outright title with a win against Michigan on Friday at Carver-Hawkeye Arena.
NOTES: Iowa clinched at least a share of the Big Ten Conference regular season title for the seventh time in the past eight years ... Attendance was 15,967, the second largest dual crowd in NCAA dual history ... Iowa improves to 8-0 against ranked opponents ... Sorensen has won five in a row against ranked opponents ... Mike Evans lost for the first time this season (20-1) ... Telford improved to 8-1 against ranked opponents.