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- Bats Right, Throws Right
Guillaume Coste pitched and managed for the French national team. He has been a long-time player in the French Division Elite, still active in France's top level briefly in 2013 at age 47, though he had been managing the French squad over a decade prior. He has been active with the Lions de Savigny-sur-Orge. His brother Etienne Coste has also played for France and son Gédéon Coste has as well. His brother-in-law Philippe Denis coached for France and his father Serge Coste was an executive for the Lions.
Coste went 0-1 with a 19.29 ERA in the 1991 Intercontinental Cup, walking 9 and allowing 12 hits in only 4 2/3 IP; he had France's highest ERA. He was 1-1 with a 11.57 ERA in the 1993 European Championship, allowing 16 hits and 6 walks in 9 1/3 IP. His four games pitched tied him with Roberto Cabalisti, Christophe Gouilleux, Roderick Hopkins, Timur Triphonenkov and Joeri Loykens for second in the event, one behind Leonid Korneev.
Things were a different story as he was France's ace in the 1993 Intercontinental Cup, allowing 7 runs (1 earned) in 9 2/3 IP and going 0-1; he gave up 7 hits and 3 walks while fanning two. The next-best hurler on the team had a 11.12 ERA. He went 0-1 with a 9.75 ERA for France in the 1994 Baseball World Cup, working a team-high four games. He took the loss against the Dominican Republic.
In the 1995 European Championship, Guillaume excelled (2-0, Sv). He tied Eelco Jansen, Dante Carbini, Michael Wäller and Erik Lommerde for second in wins, one behind Frank Mathys and he tied Rolando Cretis, Carlos Ros and others for first in saves. His 0.62 WHIP was second to Lommerde and he was 5th in ERA, clearly the French staff ace. He was on the French roster in the 1997 Intercontinental Cup but did not appear. By the 2001 European Championship, he was on the French staff, but it is unclear if this was as coach or manager. He managed France in the 2001 Baseball World Cup (0-7) and 2003 European Championship (3-5) and coached for them in the 2012 European Championship.