SEATTLE (Ticker) -- The San Antonio Spurs can clinch their fourth trip to the Western Conference finals in seven years when they face the Seattle SuperSonics on Thursday.

However, the home team has won each game in this conference semifinal series.

The Spurs last reached the conference finals in 2003, when they won their second NBA title in five years.

Manu Ginobili returned to the starting lineup and scored a playoff career-high 39 points to lead San Antonio to a 103-90 victory on Tuesday and a 3-2 lead in the series,

Tim Duncan, who was named to the All-NBA First Team for the eighth consecutive year on Wednesday, scored 20 points and grabbed 14 rebounds and Nazr Mohammed added 19 for the Spurs.

San Antonio broke open the contest with a 17-3 run in the third quarter and bounced back from a pair of losses in Seattle.

Ray Allen, who has led the Sonics in scoring in nine of 10 postseason games, scored 19 points despite constant double-teaming.

Seattle hopes to have All-Star forward Rashard Lewis for Game Six after he missed the last two contests with a sprained left big toe. He averaged more than 20 points in the regular season.

Of the 123 teams who won Game Five of a seven-game series, only 20 failed to win the series.

If Seattle wins on Thursday, then Game Seven will be at San Antonio on Sunday.