Roland Garros champions Feliciano Lopez and Marc Lopez (no relation) sat down with the ATP in London for a behind the scenes doubles quiz concerning themselves and their fellow doubles players.

Fans find out that the messiest doubles team on tour is a certain set of American twins with the last name Bryan.

While Marc Lopez called his partner out when asked who takes the longest on his hair before a match:

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Lopez talks hair habits for ATP Finals doubles quiz

But Feliciano Lopez tried to take Nicolas Mahut down with him (because of his affinity for hair gel). Mahut first called himself out too, before remembering Lopez's locks.

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At the ATP World Tour Finals, Lopez and Lopez topped Mahut and Pierre-Hugues Herbert in a thrilling three-setter, 7-5, 5-7, (10-8) to keep their semifinal hopes alive.