Droguet broke for 7-5 after a gruelling deuce, saving one break point in a 5 minute hold for 6-5 before clinching the set in a 9 minute game.
Droguet broke for 3-1 and held for 4-1, but Altmaier broke for 3-4 and forced a tiebreak that Altmaier won 7-6 after 67 minutes of relentless baseline exchanges.
Altmaier and Droguet traded holds through 6-6, then Altmaier won the tiebreak to take the set 7-6 in a 7 minute decider.