Jaeckel was successful at Spring 1975 PGA Tour Qualifying School and soon joined the PGA Tour. He played in 520 PGA Tour events from 1975–1995 and recorded over two dozen top-10 finishes. Like his French Open triumph, his three best results on the PGA Tour were resolved in playoffs. He won the 1978 Tallahassee Open by shooting a final round 65 (−7) and then defeating Bruce Lietzke in a playoff. At the 1981 Tournament Players Championship he and Curtis Strange lost in a playoff to Raymond Floyd. At the 1983 Kemper Open he lost a five-man playoff to Fred Couples. Jaeckel was 7 shots back entering the day and finished hours before the last group. He passed the time at a bar, hanging out with friends and watching the event on TV.[2] These playoff losses represent his only two runner-up finishes on tour.[3]