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Auger-Aliassime, who suffered a surprise quarter-final exit at s-Hertogenbosch last week, got himself back on track here with a hard-earned 6-3 3-6 6-3 triumph. 

The second seed rolled through the first set with the minimum of fuss, but the momentum swung in Borges' favour at the end of the second as he reeled off three straight games. 

A third and deciding set was needed, with Borges missing a break opportunity in the opening game, and he was left to rue that missed chance against his Canadian opponent. 

Just as Borges did in the second, Auger-Aliassime put together a three-game winning run, and he sealed his progression with a cushioned volley at the net. 

Auger-Aliassime will face Learner Tien in the next round, and he was not the only American to advance in Germany, with Frances Tiafoe also reaching the second stage. 

Tiafoe needed just 85 minutes to register an impressive 6-2 7-6 (7-4) triumph over the recently-beaten French Open finalist Flavio Cobolli. 

At Queen's, 2024 champion Tommy Paul kick-started his quest for a second title by beating compatriot Zachary Svajda 7-5 6-3. 

It was a bad day for the home hopefuls, with Harry Wendelken and Jack Pinnington Jones both eliminated by Botic van de Zandschulp and Denis Shapovalov, respectively.