French Open 2019: Roger Federer returns, Rafael Nadal still favourite

Roger Federer returns to the French Open for the first time in four years to challenge Rafael Nadal and Novak Djokovic's bids for more records.

Nadal is chasing a record-extending 12th Roland Garros title, while Djokovic can hold all four Grand Slam titles at once for a second time.

Federer, 37, missed the 2016 event with a back injury and skipped the past two clay-court swings to preserve his body.

The Swiss great plays Italian Lorenzo Sonego at about 14:30 BST on Sunday.

Their match - which you can listen to live on the BBC Sport website - is third on the new Court Philippe Chatrier, which was demolished after last year's tournament and rebuilt as a state-of-the-art, 15-000-seater stadium, with a retractable roof to be added next year.

German fifth seed Angelique Kerber opens up the new show court against Russia's Anastasia Potapova at 10:00, before rising Greek star Stefanos Tsitsipas takes on Germany's Maximilian Marterer.

Sunday's other highlight is American seven-time Grand Slam champion Venus Williams taking on ninth seed Elina Svitolina of Ukraine, also at about 14:30 on Court Simonne Mathieu - Roland Garros' other eye-catching new arena, which is surrounded by four greenhouses.

Federer, a 20-time Grand Slam champion, reached the Madrid Open quarter-finals this month in his first clay-court tournament in three years.

"I feel good about my game. I feel good on the clay," he said.

But the 2009 champion played down his chances of winning: "It's a bit of a question mark for me. I feel like I'm playing good tennis, but is it enough against the absolute top guys when it really comes to the crunch? I'm not sure if it's in my racquet."

Federer appears to have shaken off the leg injury that forced him to pull out of his Italian Open quarter-final last week, coming through a practice session on the Chatrier show court at Roland Garros on Tuesday without any strapping.

Serbia's world number one Djokovic is expected to provide the sternest challenge to Spaniard Nadal, while American Serena Williams will aim for a record-equalling 24th Grand Slam singles title in the women's singles - if she is fit.

Former world number one Andy Murray is not playing as he continues his recovery from a hip operation, leaving Johanna Konta and Kyle Edmund as Britain's leading hopes.