The 20-year-old Australian saw off Sam Querrey on a sun-drenched Court Three, taking a decider after letting a two-set lead slip.
Midway through the fourth set he called for medical assistance, appearing to be struggling with the heat and the speed of the match - the five sets took just two hours and 10 minutes - before completing a 7-6 (8/6) 7-6 (7/3) 3-6 2-6 6-3 win.
Tomic is also having to contend with having no-one in his corner at the All England Club. His dad, John Tomic, who is also his coach, has been charged in Spain with assaulting his son's former practice partner, Thomas Drouet, but claims he was acting in self-defence.
The ATP have banned John Tomic from attending tournaments in a coaching capacity until the matter is resolved, with Wimbledon officials going one step further and preventing him from attending even as a spectator.
Bernard Tomic certainly looked like he could do with an arm around his shoulder on Tuesday as he struggled to cope in the fourth, but once that was put to bed he broke Querrey's serve in the eighth game of the decider and then sealed the win.
He later admitted that was as a result of not eating enough at breakfast, something he laughed off afterwards, but he was not jovial when it came to discussing his dad's ban.
"I'm not saying it's Wimbledon, they're harsh. I'm saying it's probably the ATP. It's their decision," he said.
"From what I know it's very disappointing and I'm going to keep saying it is. From what they investigated about my dad, whoever is on their board, he said clearly he was on the phone with my father and made a decision on behalf of that.
"You don't do that. If you're the ATP, you come on a flight, you have a meeting. They investigated something on the phone for 30 seconds and made a decision which is very bad.
"The ATP is my main concern. There are a lot of players who are disappointed with the ATP, that's for sure. I'm not going to lie and come in here at a press conference when before the post-match we always get ATP people telling us what to say.
"I'm not going to say false things. I'm going to say the truth of how I feel. It's disappointing."
All England Club officials confirmed to Press Association Sport today that John Tomic's ban stands, but his son was keen to speak to the people in power and make a change.
"For sure. I will try to have a word with them," he said.
"I know they're very strict and we'll see what they say. It would be amazing to have my dad here watching me as a coach and father. But Wimbledon are very strict.
"I'll try to talk to whoever I can but they made their decision on behalf of the ATP and they're not really going to do anything."
John Tomic was allowed into Queen's Club for the AEGON Championships two weeks ago, but today he watched his son on television from the house they are renting in Wimbledon.
When it was put to Bernard Tomic that preventing his father from buying a ticket while the backgrounds of those paying on the gate is unknown may be seen as prejudicial, he added: "Yeah, it's a good question.
"They are going on the ATP's decision and I know the ATP are talking to Wimbledon. They're basing their decision on that.
"I can't blame Wimbledon, it's all the ATP's fault I think and I'm going to keep blaming them. They know I'm not on their side, I'm on my dad's side."
Bernard Tomic said he was unaware of the validity of an internet rumour that John Tomic had tried to buy a ticket at a local tube station this morning, but did add they had spoken on the phone in the aftermath of the match.
"I spoke to him and he's very pleased that I won. It's very difficult to play a match without your coach or father who has been there your while life," Tomic said. "He's my coach and my dad. It's not like he's just a friend. But I still get to spend time with him and the house."
The ATP said it had nothing further to add, other than repeating its previous stance about John Tomic's ban.