The 1998 Sybase Open was a men's tennis tournament played on indoor hard courts at the San Jose Arena in San Jose, California in the United States and was part of the ATP World Series of the 1998 ATP Tour. It was the 109th edition of the tournament ran from February 9 through February 15, 1998.

Seeds

Champion seeds are indicated in bold text while text in italics indicates the round in which those seeds were eliminated.

  1. Australia Todd Woodbridge / Australia Mark Woodforde (champions)
  2. Brazil Gustavo Kuerten / Brazil Fernando Meligeni (first round)
  3. Australia David Macpherson / United States Richey Reneberg (quarterfinals)
  4. Zimbabwe Wayne Black / United States Jeff Salzenstein (semifinals)

Draw

Key

  • Q = Qualifier
  • WC = Wild card
  • LL = Lucky loser
  • Alt = Alternate
  • ITF = ITF entry
  • PR = Protected ranking
  • SR = Special ranking
  • SE = Special exempt
  • JE = Junior exempt
  • JR = Junior Accelerator Programme entrant
  • CO = College Accelerator Programme entrant
  • NG = Next Gen Accelerator Program entrant
  • w/o = Walkover
  • r = Retired
  • d = Defaulted

Finals

First roundQuarterfinalsSemifinalsFinal
1Australia T Woodbridge Australia M Woodforde66
United States B Coupe South Africa P Rosner341Australia T Woodbridge Australia M Woodforde67
South Africa G Stafford United States J Waite167South Africa G Stafford United States J Waite45
Armenia S Sargsian United States G Van Emburgh6461Australia T Woodbridge Australia M Woodforde77
4Zimbabwe W Black United States J Salzenstein664Zimbabwe W Black United States J Salzenstein56
United States J Palmer United States J Stark344Zimbabwe W Black United States J SalzensteinW/O
United States J Gimelstob United States B MacPhie67United States J Gimelstob United States B MacPhie
Germany T Haas Australia M Philippoussis261Australia T Woodbridge Australia M Woodforde67
Brazil N Aerts Brazil A Sá666Brazil N Aerts Brazil A Sá15
United States B Bryan United States M Bryan734Brazil N Aerts Brazil A Sá737
3Australia D Macpherson United States R Reneberg663Australia D Macpherson United States R Reneberg666
Spain J Burillo Spain A Martín13Brazil N Aerts Brazil A Sá67
United States S Davis United States A O'Brien66United States D DiLucia United States M Sell26
United States D Bowen Mexico Ó Ortiz34United States S Davis United States A O'Brien54
United States D DiLucia United States M Sell467United States D DiLucia United States M Sell76
2Brazil G Kuerten Brazil F Meligeni615