The 15-year-old Leo Borg, the 11-time Grand Slam champion Bjorn Borg's son, competed in the Stockholm Open pre-qualifying draw for the first time and on Thursday, he lost to Gustaf Ström 6-4, 6-3 in the first round.

The pre-qualifying draw winner will be able to play in the qualifying draw of the ATP 250 event that officially starts next week. But Leo Borg, who signed a deal with Fila earlier this year in June, impressed the 50 people who followed the match on the grounds, including his parents Bjorn and Patricia Borg.

'They were very good, both,' Bjorn told Expressen.se after the match. 'They have a future. Matches are matches. It's just about keeping play. It's important to work hard, have discipline and a big heart. And Leo has a big heart.

He loves what he does.' How did it feel to watch? Nervous? 'Not this way. I know how much he loves his tennis. Obviously, it's always funny to win rather than losing. But he has many years ahead.' Is it bad for Leo to have so much attention from the media and fans? 'It's special, but not bad.

Not for Leo. But it would be funny if you started writing more about Swedish tennis. There are many good guys and brother Ymers.' According to Bjorn, playing international tournaments abroad will be the key for Leo to step up: 'Leo needs to get outside Europe and go over the world.

It's important to have a good team around the road with who you feel comfortable. Which he has. Then he needs support from me and Patricia. Nothing comes for free. It's costy to be out there as tennis players.' Borg also suggested Leo may leave school soon in order to just focus on tennis and potentially start a professional career.

'I asked Leo - You do not want to continue? - I don't think so. He can always read something. But he wants to bet on tennis and make an effort now. If it works, we do not know it. We will see. He is 15 years old and he is about to start playing with older guys.' Borg also suggested that it's not up to him but to coach Rickard Billing to give Leo suggestions.

'I think it's better that them (coaches) handle things. Me and Patricia just support. Sometimes me and Leo face each other but he has his coach.' Leo has an aggressive gamestyle, which is the key for Bjorn. 'Nowadays in tennis you need to have it.

Tennis developed this way. It's about being able to be more aggressive. Leo wants to be aggressive and he feels comfortable with his gamestyle.' ALSO READ: Rafael Nadal: Worse players than David Ferrer won a Grand Slam title