Tearful Johnson remembers late father

Steve Johnson returns the ball to Japan's Yuichi Sugita during their French Open match on Monday.

America's Steve Johnson wept as he paid tribute to his late father on Sunday, describing his French Open first-round victory as "one the hardest matches I've played".
Steve Johnson senior, a widely-respected coach of more than 30 years in California, passed away suddenly earlier in May. He was just 58.
His son admitted he had suffered a rollercoaster of emotions as he came back on Monday to defeat Japan's Yuichi Sugita in a five-set match held over from Sunday night.
"Just a lot of the emotions. You know, my dad he was such a big part of my tennis life, just an emotional time. Yeah, it's not about tennis right now," said the American 25th seed.
Johnson admitted it had been tough to keep playing in Europe after his father passed away but had been buoyed but by the presence of his mother, sister and fiancee in Paris.
"My mom and sister had this whole trip planned for years now. She graduated college and they were going to come here and kind of follow me to Queen's in London and then go back before she starts work," said Johnson.
"They are here, so it makes it easier and harder all at the same time to see them. Just the pain and you just try to get through it. It's just hard."
Johnson, 27, eventually saw off Sugita 6-3, 6-3, 6-7 (4/7), 6-7 (4/7), 6-3 having had match points on Sunday when darkness halted the tie after six games of the fourth set.
"It was one of the harder matches I've played," added the world number 26.
"At the end of the third set yesterday, the emotions kind of hit me pretty hard and I was lucky to have the night to figure it out.
"But the last two weeks haven't been about tennis for me. So just trying to do the right things and move on as best as I can."
Johnson's win was a rare bright spot for American men on Monday after national number one and 14th seed Jack Sock was defeated by Jiri Vesely of the Czech Republic 7-5, 7-5, 6-3 and Ryan Harrison lost 6-4, 6-0, 3-6, 6-1 to in-form Aljaz Bedene of Britain.
On Sunday, Tennys Sandgren went down to Mikhail Kukushkin of Kazakhstan 6-2, 6-1, 6-4.
Three other American men are in action later Monday.
Jared Donaldson faces Pierre-Hugues Herbert of France, Francis Tiafoe takes on Italian 28th seed Fabio Fognini while Donald Young plays former runner-up David Ferrer of Spain.