Stefan Karlsson (badminton)
Stefan Karlsson is a retired male badminton player from Sweden who competed at the highest world level. He later changed name to Stefan Mellgård.
Career
Though he played Thomas Cup singles for Sweden and won the Swedish national singles title twice, his greatest successes came in doubles. He won men's doubles at the biennial European Championships twice, with Claes Nordin in 1980 and with Thomas Kihlström in 1982. In 1983 he shared the prestigious All-England men's doubles title with Kihlström. He won the silver medal at the 1985 IBF World Championships in mixed doubles with Maria Bengtsson.Achievements
World Games
Men's doubles| Year | Venue | Partner | Opponent | Score | Result |
| 1981 | San Jose Civic Auditorium, California, United States |  Thomas Kihlström |  Sun Zhian Yao Ximing | 15–12, 4–15, 6–15 | Silver |
IBF World Grand Prix
The World Badminton Grand Prix sanctioned by International Badminton Federation from 1983 to 2006.Men's doubles
| Year | Tournament | Partner | Opponent | Score | Result |
| 1983 | Swedish Open | Thomas Kihlström |  Steen Fladberg Jesper Helledie | 15–4, 13–15, 10–15 | Runner-up |
| 1983 | All England Open | Thomas Kihlström |  Martin Dew Mike Tredgett | 15–10, 15–13 | Winner |
| 1984 | Chinese Taipei Open | Thomas Kihlström | Steen Fladberg Jesper Helledie | 15–3, 15–6 | Winner |
| 1984 | Japan Open | Thomas Kihlström | Martin Dew Steve Baddeley | 15–6, 15–6 | Winner |
| 1984 | Swedish Open | Thomas Kihlström |  Kim Moon-soo Park Joo-bong | 8–15, 15–10, 8–15 | Runner-up |
| 1985 | Swedish Open | Thomas Kihlström | Li Yongbo Di Qiqing | 12–15, 18–14, 15–18 | Runner-up |
| 1987 | Chinese Taipei Open | Mark Christiansen |  Eddy Hartono Liem Swie King | 4–15, 5–15 | Runner-up |
| 1987 | Dutch Open | Mark Christiansen | Rudy Gunawan Bambang Subagio | 15–8, 15–2 | Winner |
| 1987 | Carlton-Intersport Cup | Mark Christiansen | Jesper Knudsen Henrik Svarrer | 15–6, 15–10 | Winner |