10:00 CET - Moving back over to Brisbane, Alex Michelsen has beaten fellow American Sebastian Korda 6-3, 7-6 in their quarter-final.

Three of the four semi-final berths are now sewn up in Queensland, and they are all occupied by Americans! The fourth won't be a Yank, however, Michelsean will face the winner of Daniil Medvedev and Kamil Majchrzak.

Meanwhile, in Hong Kong, Andrey Rublev has defeated Nuno Borges 6-3, 6-4 to set up a semi-final meeting with top seed Lorenzo Musetti.

09:08 CET - Iga Swiatek has given Poland the lead in their United Cup quarter-final tie with Australia after a 6-1, 6-1 dismantling of Maya Joint in just 58 minutes.

Meanwhile, in Auckland, top seed Elina Svitolina has come through an almighty battle to secure her spot in the semi-finals. The Ukrainian saw off Sonay Kartal in three sets, 6-4, 6-7(2), 7-6(5).

08:23 CET - Fourth seed Jessica Pegula is safely through to the semi-finals in Brisbane after a hard-fought 6-3, 7-6(3) triumph over Liudmila Samsonova.

Elsewhere, Lorenzo Musetti has progressed to the last four in Hong Kong, with the Italian beating home favourite Coleman Wong Chak-lam in straight sets, 6-4, 6-4.

07:30 CET - Good morning and welcome to our coverage of Friday's tennis!

There are a few notable results to catch you up on overnight, with women's top seed Aryna Sabalenka seeing off Madison Keys 6-3, 6-3 in Brisbane, while Karolina Muchova also moved into the last four after beating Elena Rybakina 6-2, 2-6, 6-4 in a topsy-turvy affair.

On the men's side of the tournament in Brisbane, Aleksandar Kovacevic has battled past Giovanni Mpetshi Perricard 7-6(3), 4-6, 6-3, while Alexandra Eala and Iva Jovic have advanced to the semi-finals in Auckland.

Check out the full schedule for tournaments in [lslink-league cms-href="https://www.flashscore.com/match/tennis/kovacevic-aleksandar-AudsF90U/norrie-cameron-pvzhJGY8/draw/?mid=M1PAyBb5" sport-id="2" tournament-template-id="QqLCC3il" tournament-id="UwQdP5N5" tournament-stage-id="QHeC8kom" season-id="185" target="summary"]Brisbane[/lslink-league] (ATP), [lslink-league cms-href="https://www.flashscore.com/match/tennis/cirstea-sorana-fBPsm3Iq/sabalenka-aryna-vyhksgUB/draw/?mid=nqBSOXEa" sport-id="2" tournament-template-id="vVcwNP6f" tournament-id="pbILF78a" tournament-stage-id="UZLWvHJP" season-id="185" target="summary"]Brisbane[/lslink-league] (WTA), [lslink-league cms-href="https://www.flashscore.com/match/tennis/eala-alexandra-ppu9X7PH/petra-marcinko-2J180sTE/draw/?mid=rZAEEsho" sport-id="2" tournament-template-id="va2irFDJ" tournament-id="8npJMyxS" tournament-stage-id="fsNeA5V7" season-id="185" target="summary"]Auckland[/lslink-league] (WTA) and [lslink-league cms-href="https://www.flashscore.com/match/tennis/giron-marcos-OWOgryOk/muller-alexandre-nLLdS9q0/draw/?mid=Sjfhjv16" sport-id="2" tournament-template-id="C8wqzbIc" tournament-id="bJHDLNMU" tournament-stage-id="4Stx3oFO" season-id="185" target="summary"]Hong Kong[/lslink-league] (ATP) via the links.