- Jun 7 135th Belmont: Jerry Bailey aboard Empire Maker wins in 2:28.26
French Open Women's Tennis
Jun 7 French Open Women's Tennis: In an all-Belgian final, Justine Henin-Hardenne outclasses Kim Clijsters 6-0, 6-4 for her 1st of 7 Grand Slam singles titles
French Open Men's Tennis
Jun 8 French Open Men's Tennis: Spaniard Juan Carlos Ferrero claims his lone major title; beats Dutchman Martin Verkerk 6-1, 6-3, 6-2
LPGA Championship
Jun 8 LPGA Championship Women's Golf, DuPont CC: Sweden's Annika Sörenstam wins in a playoff over Grace Park of South Korea with a par on the first sudden death hole
- Jun 8 Senior PGA Championship, Aronimink GC, PA: John Jacobs wins his only Champions Tour major title with a 2 stroke margin to runner-up Bobby Wadkins
- Jun 9 Stanley Cup Final, Meadowlands Arena, East Rutherford, NJ: New Jersey Devils beat Mighty Ducks of Anaheim, 3-0 for 4-3 series win
Cricket's T20 is Born. Howzat!?
Jun 13 English county cricket teams play the 1st official Twenty20 matches
- Jun 14 WLAF World Bowl 11, Hampden Park, Glasgow: Frankfurt Galaxy beats Rhein Fire, 35-16
NBA Finals
Jun 15 NBA Finals: San Antonio Spurs beat New Jersey Nets, 88-77 in Game 6 for franchise's second title; MVP: Tim Duncan
US Golf Open
Jun 15 US Open Men's Golf, Olympia Fields CC: American Jim Furyk wins his only major title by 3 from Stephen Leaney of Australia
Moneyball
Jun 17 "Moneyball", a book about the 2003 Oakland Athletics baseball team and GM Billy Beane's sabermetric approach, inspired by Bill James, is published
Baseball Record
Jun 23 Barry Bonds steals second base against the LA Dodgers, becoming the first player in MLB history to have 500 career homers and 500 steals
NBA Draft
Jun 26 NBA Draft: St. Vincent–St. Mary HS (Akron, Ohio) small forward LeBron James first pick by Cleveland Cavaliers
US Senior Golf Open
Jun 29 US Senior Open Men's Golf, Inverness Club: Bruce Lietzke wins by 2 strokes from Tom Watson