His best season came in 1969 when he posted a 14–3 won-loss record and a 2.91 Earned Run Average working equally as a starter and reliever. On September 20 of that year, he no-hit the eventual World Series champion New York Mets. He is also known for his wild pitch in the bottom half of the ninth inning which allowed George Foster to score the winning run in the fifth and deciding game of the 1972 NLCS, sending the Cincinnati Reds to the World Series after Pittsburgh had a one-run lead entering the bottom of the ninth.