What happens if you take a 50-50 battle, and tip it just five percentage points in your favour?

You become the No. 1 player in the world.

An Infosys ATP Beyond The Numbers analysis of year-end No. 1 players since 1991, when statistics were first recorded in tennis, uncovers that reaching the pinnacle of our sport is predicated on winning with a lot smaller margin of victory than we realise.

The following breakdown shows how many times a player finished as year-end No. 1 in the Emirates ATP Rankings, and the percentage of points he won that season.

1991-2016: Year-End No. 1 Winning Percentage of Points Played

Points: Winning Percentage Year-End No. 1 Total 55% 12 54% 7 53% 4 56% 3 TOTAL 26

The lowest average number of points won for a year-end No. 1 since 1991 is 53 per cent. Those players:

Year-End No. 1 Winning 53% Of Points

The highest average of points won for a season is 56 per cent. Those players:

Year-End No. 1 - Winning 56% Points

We can see definitive improvement at the top level of our sport. Since 2010, the lowest average number of points won has been 55 per cent, and no year-end No. 1 since 2001 has been below 54 per cent.

Infosys Nia Data reveals that current World No. 5 Rafael Nadal has won the highest percentage of points of the Top 10 so far in 2017. The Spaniard is winning 55 per cent (2711/4927) of his points and has gone 29-5 with two titles.

Federer currently leads the Emirates ATP Race To London (Nadal is second), with the Swiss winning 54.5 per cent (1921/3526) of his points so far in 2017.

Current Top 10 Points Won in 2017

To win 55 per cent of the points in a season also means that the best players in the world lose 45 per cent of all points they play.

In 2015, Novak Djokovic assembled the best winning record in recent times, winning 93 per cent (82-6) of his matches, collecting 11 titles and more than $21 million in prize money.

But the 93 percent win rate in matches was predicated on winning just 55.8 per cent (7507/13455) of points played. The Super Serbian competed in 15 finals in 2015, winning 11 and losing four. He won 73 per cent of the title matches, but won only 51.7 per cent of the points (1430/2765) in those 15 finals.

Success in tennis is built upon very small margins. Losing 45 per cent of all points you play is actually a world-class day at the office.