Roger Federer shouldn't look this good.
He has played 959 professional matches in his career, appeared in 46 consecutive Grand Slam tournaments and spent more than a decade criss-crossing time zones while collecting a record 16 major singles titles and more than $60 million in prize money. Married and the father of twin 22-month-old girls, Mr. Federer brings his family—jet lag, runny noses and all—on the road with him from Melbourne to Paris to London to New York, and many places in between.
Yet as the 125th edition of Wimbledon is set to begin next week, Mr. Federer is fresh, fit, confident and, remarkably, on the upswing after a stellar performance at the French Open, where he ended 24-year-old Novak Djokovic's 43-match winning streak and pushed Rafael Nadal, age 25 and perhaps the best clay court player in history, to four sets in the final.
"I'm in a very good place mentally and physically," he said. "I still feel very young."
As Mr. Djokovic piled up victories this season, beating Messrs. Federer and Nadal a total of seven times, it was tempting to leave Mr. Federer out of the Grand Slam conversation. His last major title came at the 2010 Australian Open and Mr. Nadal dominated the rest of the season, winning at Roland Garros, Wimbledon and the U.S. Open. But in Paris earlier this month against Mr. Djokovic, Mr. Federer either turned back the clock, or showed that in Federer years, the seconds tick away much more slowly than anyone had anticipated.
At Wimbledon, he'll engage in what promises to be a remarkable power struggle. Mr. Nadal hasn't lost at Wimbledon since the 2007 final. Mr. Djokovic badly wants to rebound from his first defeat of the year. Behind them lurks Andy Murray, 24, who won a grass-court event in London this week and is always a threat. As for Mr. Federer, no surface rewards his attacking style as richly as the lawns of Wimbledon, where he has won six titles, one fewer than Pete Sampras. He called Wimbledon the "holy grail" of the sport and his primary goal each year.
Mr. Federer, whose first major title came at Wimbledon in 2003, said his favorite childhood tennis memories were watching Stefan Edberg and Boris Becker contest three straight Wimbledon finals from 1988 to 1990.
"Just practicing at Wimbledon, being a member, putting all the whites on with the ivy on the walls, the purple and green, it's something that really touches me," he said. "It's such a sacred place in tennis."
Everyone knows about Mr. Federer's titles, his graceful technique and his boundless skills: a precise serve, a lightning forehand, deft touch and impeccable footwork. The most remarkable part of the Federer story, though, has been his uncanny ability to fend off physical and emotional fatigue and remain motivated.
Tennis history is littered with great players who succumbed to injuries or burnout. Björn Borg played his last Grand Slam tournament at age 25. John McEnroe didn't win a major title after age 25. In Paris this year, Mr. Nadal celebrated his 25th birthday—and remarked, as he struggled in early rounds, that he felt like he had been "playing for 100 years" on the pro tour. In the Open era, which began in 1968, late-career success has been rare. Only 10 men age 30 or older have won major titles, the last being Andre Agassi at the 2003 Australian Open when he was 32.
On paper, Mr. Federer has had a punishing career. Yet in all his years, he has had few significant setbacks: an ankle injury in 2005, mononucleosis in 2008 and more recently, lower back pain. He has retired from a match exactly once in his life, when he was a 16-year-old playing a junior tournament in Belgium. His immunity from injury is unparalleled.
"If I didn't know better, I would say I don't believe it," said Mr. Agassi, who climbed back to the top of the sport in his 30s, but did it after a rejuvenating break from the game. "But I've seen him do it for too long now. You can't bluff your way through it."
Mr. Federer attributes some of his resilience to a love for travel, something that his wife, Mirka, also shares. Many tennis players come to see globetrotting as soul-crushing and do little more than shuttle back and forth between their hotel rooms and the tennis courts. Mr. Federer is more inclined to soak up the local culture: When he went to Shanghai last year, he took Mandarin lessons and spent a day at the World Expo. "The tour is not supposed to be brutal and annoying," he said.
He said his twin daughters, Charlene and Myla, who will turn two late next month, haven't lessened his desire to win or train. He and the family travel by private jet and his parents and babysitters help with the kids.
Another asset when traveling with family: Unlike many professional athletes, Mr. Federer is not superstitious. "It doesn't need to be the same every day, doesn't need to be the same shower I use, the same restaurant I go to, the same hour I go to sleep," he said. "I've always been very flexible. I don't care if I practice at nine in the morning or 10 p.m."
Mr. Federer has been planning his attack on time—to not just be great, but to do it for longer than anyone else has done it—since he first became No. 1 in 2004. He recalled a conversation he had with his long-time physical trainer, Pierre Paganini, as he closed in on the top of the game.
"I was at a crossroads to decide, 'Am I happy with winning two Slams, one World Tour final, world No. 1? Will that suffice for me, or do I want to achieve more?' " he said. "I remember a very strong conversation with Pierre, we always said, 'If I do hit world No. 1, I won't overplay,' because I tried to look at the long term. I didn't want to just chase everything possible in the short term."
Each year, Messrs. Federer and Paganini block out at least three two- to four-week training periods (usually one each in December, February and July, and sometimes another in the fall). Mr. Paganini said there are four components to each session: rest and recovery, meaning, take time off and start training slowly; strength and endurance exercises not specific to tennis; tennis-centered exercises, such as footwork patterns on a court, but while using medicine balls, not rackets and tennis balls; and tennis practice. Many of these sessions have taken place in the Dubai heat, though Mr. Federer trains there less often since he became a father. He also stretches several times a day.
In the last two years, Mr. Federer has put extra emphasis on his abdominal muscles in response to back pain that lingered long enough, he said, to cost him several training sessions (he cited the injury at Wimbledon last year, when he lost in the quarterfinals).
"After doing it for over one and a half, two years now, it's paying off," he said. "If the back is going to stay this way for the rest of my career, I'll be very happy."
Mr. Paganini, a chiseled 53-year-old, looks like he works out as often as an average person drinks water. He has known Mr. Federer since Mr. Federer was a 14-year-old prize talent in the Swiss Tennis Federation, where Mr. Paganini worked as a trainer in the junior program. He has been Mr. Federer's personal trainer since 2000. He described Mr. Federer as a rare combination of creative and disciplined.
"Usually, when you're an artist, you have not so much structure," Mr. Paganini said. "And when you're a hard worker who is maybe less of an artist, then you're very organized. He is able to do both. Roger is a champ because he's the boss of his talent."
Mr. Paganini says there are two essential elements of Mr. Federer's longevity. First, he still trains with the enthusiasm of a junior. "Sometimes I think, 'Damn it, he's doing these exercises now 2,756 times, but he does it as if it was the first time," Mr. Paganini said.
Mr. McPhee masterfully uses the 1968 U.S. Open semifinal match between Arthur Ashe and Clark Graebner to explore the intricacies of human character and culture.
The man who hated tennis and later learned to love it tells all, from the ball machine that shaped his childhood (he called it "the dragon" to drugs to winning every major title in the game.