Initially he played for Hertha Zehlendorf with which he won the Regionalliga Berlin - part of the national second tier which was split up into five regional divisions - in 1969 and 1970. After this he joined first division side Rot-Weiss Oberhausen where he immediately established himself in the standard formation. After narrowly avoiding relegation he transferred together with Franz Krauthausen to the 1971 runners-up of the national championship FC Bayern Munich. Again, he immediately became part of their standard formation, playing alongside the stars of that era like Franz Beckenbauer and Gerd Müller. He played in 25 of the first 27 league matches of the side that went on to win in 1972 the third national championship in club history. In a cup match against 1. FC Köln in April 1972 he sustained a broken leg, which precluded him from almost two years. Comeback attempts with Swiss first division side Grasshopper Club Zürich, where he played in March and April 1974 in six matches, albeit only one over 90 minutes, and Tennis Borussia Berlin, then a newcomer to the German first division, where he played in eight matches, thereof three over the full 90 minutes, between August and October of the same year, essentially failed. Notwithstanding, he scored a goal in his last match for the Berliners. He came to the U.S. as a player and assistant coach in the NASL. He was named the 1976 Soccer Bowl MVP after capturing the title with Toronto Metros-Croatia. The following season he earned All-NASL First Team honors, joining legends who were on the same team that year, Pelé, Gordon Banks, George Best, and Franz Beckenbauer.
Managerial career
Sühnholz was a national team coach for the U.S. Soccer Federation from 1996–2001; 1996–1999 as an assistant coach for the U-16 and U-20 Nationals Teams; head coach for the U.S. U-20 Men National Team from 1999 to 2001. While coaching for the U.S. Soccer he went to two World Cups and led his U-20 Teams to the World Cup in 2001 in Argentina. Since 2001 he was a head coach for the USYS ODP Region III, coaching the 86, 87, 88 and 89 boys' teams. A founder, along with Francisco Marcos, of the Austin Sockadillos, a team in the Southwest Indoor Soccer League, Sühnholz served as an assistant coach for the team from 1987 to 1989 when he replaced head coach Tony Simoes. He then coached the team until 1991. In 1994, he returned to the team, now known as the Austin Lone Stars of the USISL. In May 1997, he was named an assistant coach with the United States U-16 men's national soccer team. He returned to the Lone Stars in 1998. Sühnholz held a USSF "A" License.
