In the 2019/20 season, Maimouna Diarra played in Spain with Femení Sant Adrià and she averaged 12 points (58% 2P), 9.3 rebounds and +16.8 efficiency in 24 minutes per game (21.1 points, 16.8 rebounds and +29.4 efficiency per 40 minutes).

In the 2020/21 season, Maimouna Diarra signed in Spain with Campus Promete and she averaged 8.1 points, 10.3 rebounds and +13.7 efficiency per game, being the second best rebounder in Spanish top league.

Maimouna Diarra re-signed with Campus Promete in the 2021/22 season and she had a successful season again with 8.4 points, 8.3 rebounds and +11.3 efficiency in 21 minutes per game.

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