The first week of the grass-court season gave us many interesting numbers and statistics from Stuttgart, 'S-Hertogenbosch and Nottingham events.
75 - Combined years between Tommy Haas and Roger Federer, who played in Stuttgart the oldest match on the ATP Tour since 1982 Vina del Mar, when Luis Ayala (49 age) and Ricardo Cano (30) were 79-years-old combined.
3 - Players able to beat Federer twice on grass. Defeating him in 2012 Halle final and 2017 Stuttgart second round, Haas joined Novak Djokovic and Lleyton Hewitt. Haas also became the oldest player to beat a top-five player since Memphis 1992, when Jimmy Connors defeated Michael Chang at 39 years and five months.
15 - Consecutive years where Roger Federer was not beaten in an opening round Match on grass. Last time it happened was 2002 Wimbledon against Mario Ancic.
2 - Federer's losses against outside top 300 players. In 1999 Washington the World No. 405 Bjorn Pau defeated him, almost 18 years after Haas did it.
2 - Federer's losses this year: against Evgeny Donskoy in Dubai and Tommy Haas in Stuttgart, both having match points.
8 - Tournaments played by Federer in the last 12 months. 'No more breaks this year', the Swiss player assured in press conference in Stuttgart.
1 - Match point saved by Pouille in Stuttgart at second round level against Struff, with amazing reflexes at the net.
11 - Finals lost by Feliciano Lopez in career on 16 played overall. On grass he has not been winning since 2014, when he triumphed in Eastbourne for the second time in a row.
21 - Months that Thanasi Kokkinakis waited to come back to win a singles match on the ATP Tour. He did it in 's-Hertogenbosch against Mikhail Youzhny. Last win was against Alexandr Dolgopolov in 2015 Winston Salem.
18 - Tournaments played this year so far by Benoit Paire, which is the most possible based on ATP Calendar. 20 wins and 18 losses for him, 38 matches in total. And we are only at the beginning of the second half of the season...
11 - Match points that Jamie Murray and Bruno Soares needed to beat Nikola Mektic/Brian Baker at second round level in Stuttgart, prevailing 6-4, 6-7(8), 10-8.
5 - Matches won by Grigor Dimitrov from March (Indian Wells) until today. Eight losses for the Bulgarian, who is going through a shocking crisis after that in January he had won Brisbane title and reached Australian Open semifinals.
72 - Ivo Karlovic (38) and Gilles Muller (34) years played the oldest ATP Final since 1977, when in Hong Kong the 43-year-old Ken Rosewall defeated the 31-year-old Tom Gorman. Karlovic-Muller was also the seventh ATP Final this year with over 30 players
27 - Years that 'S-Hertogenbosch event waited to have all the first four seeds in the semifinals: Marin Cilic, Alexander Zverev, Karlovic, Gilles Muller. It's the first time it happened in the tournament history.
3 - Surfaces where Gilles Muller reached ATP Finals this year: two won in Sydney (hard), 'S-Hertogenbosch (grass) and the one lost in Estoril (clay).
7 - Sets played in career between Muller and Karlovic against each other, all ended at the tie-break.
64 - Aces by Karlovic in four matches played, 29 of them in the semifinals against Cilic. He now hit 12,003 aces, which allows him to consolidate his all time record.
4 - Sets won in a row by Ivo Karlovic in 'S-Hertogenbosch without playing a tie-break. Last time it happened on grass courts was 2008.
16 years and eight months - Felix Auger Aliassime's age. In Lyon the Canadian became the seventh youngest player to win a Challenger title. In this special list he also overcomes Djokovic, who had won at 17 age.
36 - Years that Great Britain has not been having a champion triumphing at home. Last time it happened was in October 1981 (Sue Barker at Brighton). Will probably Johanna Konta, or another home favourite player, manage to break this negative streak in the next few weeks?
2 - Career-titles for Donna Vekic. The Croatian player won Nottingham last week two-and-a-half years after 2014 Kuala Lumpur. Finally some great tennis by Wawrinka's girlfriend, who reached her first final on the women's tour in 2012 Tashkent at age 16.
89 - Places in the rankings earned since March by Anett Kontaveit. She was No. 125 in Indian Wells, then she reached Biel Final, Stuttgart and Rome quarters, won 's-Hertogenbosch title. She is No. 36 (her career-best ranking) this week, and is getting closer to be a seeded player in Wimbledon.
3:35 - Hours and minutes of the match between Mikhail Youzhny and Yuichi Sugita who played the final round qualifying draw match in Halle. It's the second longest match ever in the tournament history after Stebe vs L. Mayer in 2011 (3 hours and 42 mins). Youzhny prevailed in the third set tie-break 14-12 converting his 12th match point.