Men’s top seeds

RAFAEL NADAL (1), Spain

2017 match record: 66-11 (6 titles)

Career singles titles: 75 (16 majors, 1 Australian Open) Topspin: Returned from lengthy injury layoffs last year to reach the Australian Open final, seeded ninth, and renewed his vintage rivalry with Roger Federer, who won in five sets. ... Went on to win his 10th French Open title — becoming the third man to win majors in teens, 20s and 30s — and the U.S. Open . ... Finished 2017 atop the rankings, becoming the oldest year-end No. 1 in the history of ATP rankings . ... His preparation has been hampered by a right knee injury that has restricted him to two exhibition events at the start of the season . ... Until his shocking first-round loss to Fernando Verdasco in 2016, had reached the quarterfinals or better at every Australian Open he had contested since 2007.

ROGER FEDERER (2), Switzerland

2017 match record: 52-5 (7 titles)

Career singles titles: 95 (19 majors, 5 Australian Opens) Topspin: Taking the last half of the 2016 season off to let his surgically repaired left knee heal did the trick for him last year, which he kicked off by winning his fifth Australian title and ending a long sequence of defeats in Grand Slam finals against Nadal . ... After skipping the French, won Wimbledon for a record eighth time and become the second-oldest major winner in the Open era behind Ken Rosewall . ... With the exception of a third-round exit in 2015, has reached the semifinals or better at Melbourne Park every year since 2004 . ... Warmed up by combining with Belinda Bencic to win the Hopman Cup international mixed teams tournament for Switzerland.

GRIGOR DIMITROV (3), Bulgaria

2017 match record: 49-19 (4 titles)

Career singles titles: 8 (no majors)

Topspin: Coming of his best season to date, when he finished at a career-high No. 3 and went 5-0 to win the season-ending ATP Finals . ... In 2017, started the year by winning the Brisbane International title and then making a career-best run to the semifinals at the Australian Open, where he lost in five sets and almost 5 hours to Nadal . ... Failed to defend his Brisbane title last week when he lost to eventual champion Nick Kyrgios in the semifinals.

ALEXANDER ZVEREV (4), Germany

2017 match record: 55-22 (5 titles)

Career singles titles: 6 (no majors)

Topspin: Finished behind only Federer and Nadal for most titles in 2017 in a season that earmarked him for bigger things to come . .... Produced the biggest victory of his career to beat Djokovic en route to his first ATP Masters title at Rome . ... Beat Federer in the final of the Masters tournament in Montreal . ... Reached a career-high No. 3 ranking in November, becoming the youngest player since Djokovic in 2007 to break into the Top 3 . ... For all his success at Masters level, still hasn’t made a run to the quarterfinals of a major . .... Helped Germany reach final of Hopman Cup in Perth.