Alexander Zverev explains how he defeated Roger Federer at the ATP Finals

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• Roger Federer

In press conference at the ATP Finals in London Alexander Zverev explained how he managed to defeat Roger Federer for the third time in his career, tying head to head meetings on 3-all. 'I played really well', Zverev recognized.

'I played really aggressive from start to finish. I knew I had to be the one that was aggressive, kind of not letting Roger dictate. If Roger dictates, you have no chance of winning a match. I knew that from start to finish. I executed well, hit a lot of winners, obviously served okay, as well.

All in all, I'm happy with how I played.' Zverev was confident heading into the match: 'I think I've been hitting it well all year, but some people don't think that. As I said, against Roger, you have to be the one that is aggressive.

You have to kind of take the time away from him, otherwise, as I said, he's not going to lose the match, especially in a big match, in a big tournament, where he already found his rhythm in the last two matches, playing really good tennis.

You kind of have to take that away. That's what I tried to do. It worked out well.' Zverev also reflected on the crowd booing him: 'It was a very happy moment for me that I won the match. I was in the finals. But it was a very sad moment in the same time because that was not the way I wanted to win.

When the booing was happening, it's never a nice feeling. Especially I said to Roger sorry at the net afterwards. And he said, You have absolutely nothing to apologize, don't worry about it. But the crowd, maybe some of the people didn't know what actually happened, what the situation was.

We were kind of in a rally, then after that I served an ace, which didn't help the situation either. I was very emotional afterwards. The booing went into cheering kind of afterwards, which kind of helped me, as well. Obviously a lot of emotions going on through my head.

I was really upset afterwards in the locker room, as well. I'm not going to lie. I had to take a few minutes for myself. But, you know, I hope the crowd and the people who were booing maybe look at what actually happened, maybe just realize that I've maybe not done anything wrong.' ALSO READ: Rafael Nadal: Worse players than David Ferrer won a Grand Slam title