1998 | 2011 ATP Challenger Tour | 2012 ATP Challenger Tour | 2013 ATP Challenger Tour | 1998 in music | PGA Tour | ATP World Tour 250 series | Tour de France | ATP World Tour 250 Series | 2013 ATP World Tour | 2012 ATP World Tour | 2001 ATP Tour | 2011 ATP World Tour | ATP World Tour 500 series | 2010 ATP World Tour | 2003 ATP Tour | Grand Tour | ATP World Tour Masters 1000 | 1996 ATP Tour | 2002 ATP Tour | 1998 FIFA World Cup | WTA Tier III tournaments | WTA International tournaments | WTA Premier tournaments | 2013 WTA Tour | 2006 ATP Tour | 1998–99 in English football | World Poker Tour | 2004 ATP Tour | Champions Tour |
The 1998 Japan Open Tennis Championships was a tennis tournament played on outdoor hard courts at the Ariake Coliseum in Tokyo in Japan that was part of the International Series Gold of the 1998 ATP Tour and of Tier III of the 1998 WTA Tour.
The 1998 Piberstein Styrian Open was a women's tennis tournament played on outdoor clay courts at the Sportpark Piberstein in Maria Lankowitz in Austria that was part of Tier IV of the 1998 WTA Tour.
The 1998 Pilot Pen International was a tennis tournament played on outdoor hard courts at the Cullman-Heyman Tennis Center in New Haven, Connecticut in the United States that was part of the International Series Gold of the 1998 ATP Tour and of Tier II of the 1998 WTA Tour.