Andy Murray recovered from a set and 3-0 down to claim a record fifth Queen's Club title at the Aegon Championships in London on Sunday.
The top seed and world No. 2 from Scotland beat third-seeded Milos Raonic of Canada 6-7 (5), 6-4, 6-3.
Murray, 29, becomes the first man to win five titles at the tournament, which was established in 1890. His previous titles came in 2009, 2011, 2013 and 2015.
McEnroe was courtside for the final in his role as coach to the 25-year-old Raonic. Ivan Lendl was in the opposite corner after rejoining Murray as his coach a week ago.
"It was nice of him to stick around for the presentation," Murray joked after seeing that Lendl had quickly left the court. "It was obviously a good first week back together."
The win also marks Murray's seventh career grass-court championship.
Murray was down 0-3 in the second set and had yet to break Raonic. But Murray gradually read Raonic's serve better and a backhand service return winner at 1-3 put the second set back on serve. Murray would break Raonic three more times in the final two sets to claim history on his first Father's Day.
"Coming out here to try and win for the fifth time I was really motivated," Murray said. "It was frustrating to be down a set and a break but I started to return well, and my serve worked very well the last couple of sets. I played some good stuff."
American Madison Keys beat Barbora Strycova of Czech Republic 6-3, 6-4 to win the Aegon Classic in Birmingham, England.
The 21-year-old Keys, the seventh seed, clinched her first title in 2016 and second WTA crown ahead of the start of Wimbledon later this month.
Keys, a quarterfinalist at last year's Wimbledon, played near-perfect grass-court tennis during the 79 minute match, hitting 27 winners to 16 unforced errors.
"I am just going to focus on this -- I am really happy," Keys said. "I will start focusing on Wimbledon tomorrow."
By reaching the final on Saturday, Keys broke into the world's top 10 for the first time.
Gerry Weber Open
Florian Mayer returned to the ATP winners' circle, beating fellow German countryman Alexander Zverev 6-2, 5-7, 6-3 to capture the Gerry Weber Open in Halle, Germany.
As quickly as Mayer won the first set, Zverev shifted the momentum in the second, reeling off nine of the first 10 points of the set.
In the third set, they remained on serve until the sixth game, when Mayer won 11 straight points for a 5-2 lead. He would deny a break point when serving for the match a game later, closing it out on his fifth championship point after one hour and 55 minutes.
The 19-year-old Zverev upset eight-time champion Roger Federer in Saturday's semifinals.