Alex De Minaur picked up his first win in over a month after defeating Francisco Cerundolo in Hamburg, with Ben Shelton also winning.
Taylor Fritz, along with Alejandro Davidovich Fokina, Ugo Humbert and Jenson Brooksby booked their place in the semi-finals at Eastbourne.
Alexander Zverev recovered after his Stuttgart final defeat to beat Marcos Giron in Halle.
Alexander Zverev shook off last weekend's Stuttgart Open final defeat to make a strong start at the Halle Open.
No matches available.
'%20transform='translate(-56%20-679)%20translate(40%20141)%20translate(16%20538)'%3e%3cg%3e%3cpath%20fill='%23000'%20fill-rule='nonzero'%20stroke='%23979797'%20stroke-width='.5'%20d='M6.608%200C2.964%200%200%202.99%200%206.667c0%203.676%202.964%206.666%206.608%206.666%203.644%200%206.608-2.99%206.608-6.666S10.252%200%206.608%200zm0%201.111c3.048%200%205.507%202.48%205.507%205.556%200%203.075-2.459%205.555-5.507%205.555-3.048%200-5.507-2.48-5.507-5.555%200-3.075%202.46-5.556%205.507-5.556zm-.55%201.111v5h3.854v-1.11H7.16v-3.89H6.058z'%20transform='translate(1.322%201.333)'/%3e%3c/g%3e%3c/g%3e%3c/g%3e%3c/g%3e%3c/g%3e%3c/svg%3e)
