The World No. 1 fended off a set point when trailing 3-5 before clinching the opening set in a tie-break against World No 51 Otte. A solitary break in the second set was enough to secure a 7-6(3), 6-3 semifinal victory in the pair's first ATP head-to-head meeting.
Medvedev was pleased to prevail in another high-quality clash with Belarusian Ivashka, who was aiming to reach his fourth quarterfinal of the season on the Halle grass.
Following a strong second-set performance to tie the match, the World No. 45 clinched a crucial break late in the deciding set to advance to the quarterfinals on his tournament debut.