Postpublished at 10:33 Greenwich Mean Time 17 January 2018
Jill Craybas
Former world number 39 on BBC Radio 5 live sports extra
I don't know much about Mackenzie McDonald to be honest. I've heard about him and that he's highly talented.
Having watched the first set, he's got a great serve and places it really well and I've been really impressed with how he's managing himself here on Rod Laver Arena.