Zverev won the first two sets against Zverev but dropped sets three and four 6-2 7-6 to send the match into a decider.
But just a few games into the final set, viewers in the UK watching on ITV4 saw the broadcaster leave the Zverev match and return to the studio where host John Inverdale spoke to Edmund, who won his match against Jeremy Chardy earlier in the day after it was postponed overnight.
And it was a decision which frustrated fans who were keen to watch the conclusion of Zverev’s match.
One fan said: “I hate my country for not showing Zverev suddenly during the final set.”
Another wrote: “ITV leaving Zverev v Millman in a LIVE FIFTH SET to go to an interview with Kyle Edmund.
“Where they ask Edmund about the upcoming Champions League final as he’s a Liverpool fan. I give up.”
While another viewer added: “Actually [a] ridiculous decision.”
Zverev did eventually come through to beat Millman in four hours and eight minutes 7-6(4), 6-3, 2-6, 6-7(5), 6-3 and take his place in the second round.
After the match, Zverev said he was expecting a tough battle from the gritty Australian.
“Exactly how I expected it to be honest. I expected it to be a very long match. I expected it to be a very tough match,” Zverev told Tennis Channel.
“John is someone who plays unbelievable at Grand Slams, he always has. He’s very very, very fit.
“I knew that it was going to be difficult and I’m just happy to be through.”