Briton admits performances in 2017 have not been good to remain atop of the ATP rankings.
2015 champion prevails 6-7 6-3 5-7 7-6 6-1 to seal second final appearance at Roland Garros.
Andy Murray face Stan Wawrinka in the first semi-final of the 2017 French Open on Friday.
Mark Petchey believes that troubled Serbian is "too good not to return to his best" after French Open exit.
World number one faces fellow three-time major winner Stanislas Wawrinka in French Open semi-finals.
World number one wins 2-6 6-1 7-6 6-1 to reach last four for fourth time in a row.
An abdominal problem forces the Spaniard to withdraw after 50 minutes of action.
Patrick Mouratoglou says Nadal is currently playing like a train at full speed.
World number one's former coach believes Murray is peaking at the right time.
Becker also thinks either Federer or Nadal can finish the year as number one in the singles race.
World number one brushes aside inexperienced Russian in straight sets at Roland Garros.
Nine-time champion completes fourth straight sets win of campaign at Roland Garros.
Andy Murray is currently in the round of 16 of the French Open as he looks to turn his year around.
World number one shows glimpses of his best in three-set win over Argentine.
Tennis professionals have called for a name change for the Margaret Court Arena in Melbourne.
World no.1 overcomes spirited Slovak in four sets in gritty affair at Roland Garros.
Court claimed tennis is 'full of lesbians' and voiced her opposition towards same-sex marriages.
World no.1 into second round after 6-4 4-6 6-2 6-0 win over the Russian.
Exclusive: The 2002 French Open winner confident his fellow Spaniard will triumph at Roland Garros.
Zverev has beaten Federer and Djokovic and come close to upsetting Nadal in his short career on the tour.
Johanna Konta drawn against Hsieh Su-wei of Taiwan in the first round at Roland Garros.
World #1 believes Agassi's appointment is a "positive thing for Novak" and "good for tennis".