Duke currently owns 40 PBA Tour titles, including seven majors: one ABC Masters, one PBA Tournament of Champions, two United States Opens, and three PBA World Championships. By virtue of having won each of these four majors, Duke is one of only three bowlers in Tour history to complete the career Grand Slam, along with fellow Hall-of-Famer Mike Aulby and all-time major titles record holder Jason Belmonte. His 38th title on February 15, 2015 put him in sole possession of third-place on the PBA's all-time titles list. Duke's career PBA Tour earnings eclipsed $3 million in the 2011-12 season, making him just the third PBA bowler at the time (along with Walter Ray Williams Jr. and Pete Weber) to surpass the $3 million mark in career prize money. Parker Bohn III has since also joined the $3 million club. Duke's career earnings have now topped $3.6 million (as of 2019). Duke made multiple TV Finals appearances every season from 1990 through 2015. (He made only one TV finals appearance in 2016.) He has won at least two titles in a season nine times, including a career-best five titles in 1994.