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The following events happened in world sport in the year1998.
Men's professional
Men's amateur
Women's professional
Steeplechases
Flat races
The following is a list of major noteworthy MMA events during 1998 in chronological order.
| Date | Event | Alternate Name/s | Location | Attendance | PPV Buyrate | Notes |
| March 13 | UFC 16: Battle in the Bayou | — | 4,600 | — | This event featured the first ever UFC lightweight tournament. As well as a middleweight championship bout. And a heavyweight and middleweight superfights. | |
| March 15 | Pride 2 | — | — | — | Event featured six MMA bouts and twokickboxing bouts. | |
| May 15 | UFC 17: Redemption | — | — | — | This event was the last UFC event aside fromUFC 23, to feature the "tournament" style format. This event featured a four-man middleweight tournament. As well as three heavyweight superfights. | |
| June 24 | Pride 3 | — | — | — | — | |
| October 11 | Pride 4 | — | — | — | — | |
| October 16 | UFC Brazil: Ultimate Brazil | UFC 17.5 | — | — | This event caused controversy due to the fact that the Brazilian flag was wrongly represented on the promotional material. |
Grand Slam in tennis men's results:
Grand Slam in tennis women's results: