Bertens, the No.2 seed, recorded a 7-6 (7-2) 4-6 6-2 victory for her seventh WTA Tour title and third of 2018, adding to her previous successes in Charleston and Cincinnati this year.

Tomljanovic fought back from a set down to send an entertaining final into a decider, and ensured Bertens had to work for her prize.

Despite serving six double faults in the first set, Bertens took the opener in a tie-break after twice coming from a break down.

Tomljanovic again landed the first blow in the second set, but she was unable to consolidate after breaking for a 2-0 lead.

A fine backhand pass down the line saw Bertens break for 4-3, only for Tomljanovic to respond in style, winning three straight games to level the match before taking a 2-0 lead in the third set.

But, with a maiden title appearing on the cards when one point shy of going 3-0 up, she faded badly down the stretch.

Bertens, in contrast, finished strongly, reeling off six games on the spin to not only secure the trophy but also boost her hopes of qualifying for the season-ending WTA Finals in Singapore.