Holger Rune was very unlucky in his match against Andrey Rublev failing to convert multiple chances to win the match and his coach was equally disappointed.
Rune paired up with Patrick Mouratoglou after Simona Halep got suspended from the Tour and it's been a very successful cooperation since then. He played amazing tennis to finish the year, winning the Paris Masters and beating Novak Djokovic in the final. The start of the year was solid as well but his most recent match didn't end well.
Up 5-2 in the final set, two match points at 6-5 and up 7-3 in the match tiebreak. None of that mattered as Rublev survived it all and converted match point on a net cord ball. Mouratoglou was disappointed to see it:
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“It is always disappointing to lose, and even more on a net cord ball. We have to congratulate Andrey Rublev for a great match and wish him to go far into the Australian Open! I want to express my admiration for this young player Holger Rune for all the progress he has made. He is courageous, he is full of enthusiasm and energy and he will achieve great things in the future without a doubt."