Djokovic impressed by Kohlschreiber's tactics.
Top seed tumbles at Indian Wells.
Finalist Marin Cilic made light work of Yoshihito Nishioka to reach the second round of Wimbledon.
World number one into the quarter-finals - just!
Roger Federer kicked off his campaign for a 10th Gerry Weber Open title with a win over Aljaz Bedene.
Philipp Kohlschreiber was sent packing at the MercedesCup as he went down to Denis Istomin.
Juan Martin del Potro has crashed out of the Madrid Open.
Alexander Zverev brushed aside Philipp Kohlschreiber to win the BMW Open for the second year in a row.
Alexander Zverev into Munich final.
Top seed and defending champion Alexander Zverev has cruised into the semi-finals of the Munich Open.