In their 1968–69 season Basel finished the Nationalliga A season as champions one point ahead of Lausanne Sports in second position. Basel won 13 of the 26 games, drawing ten, losing three times, they scored 48 goals conceding 28. Benthaus played in 11 league matches and scored five league goals. In the Swiss Cup Basel started in the round of 32 with a win against Thun and in the round of 16 they beat Luzern. In the Quarter-final Basel played an away game against Servette but lost this 1–0. In the Inter-Cities Fairs Cup Basel were drawn against Bologna. Bologna won both games. In the 1968 Cup of the Alps the team managed to win the group and played in the final against FC Schalke 04 but were defeated 3–1 after extra time.
