PUNE: Daniel Altmaier knows what confidence can do to a tennis player.
The 23-year-old German won three ATP Challenger titles last year to break into the top-100 in world rankings. But even before that, the Kampen native showed glimpses of his potential when, entering as a qualifier, he beat then No. 8 Matteo Berrettini to record a top-10 win in his maiden French Open main draw appearance in 2020.
