ATP Cologne results on Tuesday(x denotes seeding): 1st round John Millman (AUS) bt Fernando Verdasco (ESP) 6-4, 6-2 Pierre-Hugues Herbert (FRA) bt Tennys Sandgren (USA) 6-3, 3-6, 6-3 Jannik Sinner (ITA) bt James Duckworth (AUS) 6-1, 6-2 Alejandro Davidovich (ESP) bt Damir Dzumhur (BIH) 6-2, 6-3 Oscar Otte (GER) bt Dennis Novak (AUT) 6-3, 6-2 afp