Ever since the Open Era began in 1968, we can identify the individuals and their periods of success. First came Laver, Rosewall and Newcombe; next was Borg’s reign, bookended by Connors, McEnroe and Lendl. Wilander and Becker ushered in the ’90s before giving way to Sampras and Agassi.

Federer, Nadal and now Djokovic have run the show since then, but there is no heir apparent. The average age of the ATP top 10 is 29.7 — the highest it has ever been — with an unprecedented five of its current members aged over 30. Read more

The last time athletics was engulfed by doping concerns of the volume seen last week was the 1980s, when performance enhancing substances including testosterone were commonplace among elite competitors.

This doping dark age left a mark still visible today in the form of records set decades ago that are still yet to be broken – and in some cases yet even to be approached. Read more

A dozen games into the new Premier League season, Chelsea’s title defence has been anaemic, and few — if any — saw it coming. But with the aid of hindsight, shots data and the Elo ratings system, we can obtain a clue as to exactly when their troubles began: January 1 2015. Read more

Since he shot to teenage stardom, Wayne Rooney has formed the mainstay of every team he has been part of, both at club and international level, and has stayed relatively injury free.

He is one of a select few world-class strikers to have played more than 50,000 minutes by their 30th birthday, but is he worn out as a result, and what might he learn from former Real Madrid star Raúl, whose career trajectory is almost a perfect match for his own? Read more

Belgium's rankings according to Fifa and eloratings.netWins earlier in October against Israel and Andorra will see the team leapfrog Argentina and Germany when Fifa’s rankings are updated next month, but how highly do alternative systems rate the Red Devils? Read more

The World Athletics Championships are taking place this week in Beijing, and Usain Bolt’s narrow victory over Justin Gatlin in the men’s 100m final rounded off the opening Sunday.

Always one of the biggest moments of any athletics meet, this year’s race was especially eagerly anticipated given the narrative that had built around Gatlin. Read more

Between 2009/10 and 2014/15 spending by England’s local authorities was cut by a fifth — more than twice the rate of spending cuts to the rest of the UK public sector. Our Local Cuts Checker database brings together a myriad of data to allow readers to explore the impact of those cuts in their areas.

Our new unemployment tracker shows the latest jobs data across the European Union, including top-line figures for each country’s constituent regions. The most recent figures are for September 2014.

You can also download the latest data using the link beneath the graphic. Read more

Updated May 06 2015

Note: the five parties shown are those for which every polling company in our poll-of-polls provides individual figures.

UK voters will elect a new parliament in a general election on May 7. Our poll-of-polls tracks all national-level voting intention polling figures going back to the 2010 election – the dots on our chart – and then calculates a rolling score for each party adjusted for recency and different pollsters. Read more

In 1961, the average UK 20-something sat in the upper third of the income distribution after deducting housing costs, but the subsequent 50 years have seen a dramatic reversal in their fortunes. Explore the UK’s widening generation gap over income with this interactive graphic. Read more

Roger Federer was eliminated from the Australian Open when he lost a match in which he won the majority of the points.

Was it a one-off, or a sign of an underlying issue? And how does his rival Rafael Nadal compare when it comes to winning the biggest points in tennis? Find out in our interactive graphic Read more

156 players have reached the top ten of the ATP men’s singles rankings since they were established in 1973. How do they compare on success and longevity?

Find out in our interactive graphic Read more

The UK’s ‘two speed’ housing market is not a novel concept, but new figures highlight the regional and political split like never before.

Use our interactive graphic to explore how geography and politics divide fortunes in Britain’s property market. Read more

It is said that money makes the world go round, but in football’s transfer market we can be a little more specific on that money’s provenance. Our interactive graphic explores the net spend of the 265 clubs in world football to have each spent £10m or more in total since 1980, grouped by country.

Any guesses on the identity of the country whose clubs spend the most? Read more

Statistics suggest that it is was never a successful tactic beyond gaining short term momentum Read more

Manufacturing and technology giants Samsung, Hyundai, SK and LG are examples of chaebol – multinational Korean conglomerates with labyrinthine ownership structures, often controlled by the founding family. Use our interactive graphic to explore the relationships between companies in each chaebol Read more

They cost billions of dollars, symbolise economic power and are photographed by millions, but the world’s tallest buildings also compete on a lesser known measure that pushes the limits of modern engineering: elevator speed. These ultra-fast lifts can reach speeds of 20 metres per second (45 mph) and feature technologies that use heat resistant brakes, mitigate excess vibration and adjust for air pressure to prevent ear blockages. Our graphic shows the top speeds of elevators in eight of the world’s tallest and most famous buildings, and how far they have traveled since this web page loaded Read more

By John Burn-Murdoch and Gavin Jackson

In the latest instalment of The Baseline, our weekly feature on sports statistics, we looked ahead to the ATP Tour Finals, the climax of the men’s tennis season.

The tournament is played on a hard court surface, which goes some way to nullifying the relative advantages afforded to big serving and big returning players by grass and clay courts respectively. But where exactly does hard court fall between those two extremes, and what can this tell us about its impact on the playing styles of grass and clay specialists? Read more

The current Ebola virus outbreak has claimed more than 4,000 lives in West Africa, as well as one in the US where the victim had been visiting Liberia, the country with the highest death toll so far.

Our interactive graphic tracks the outbreak’s spread since the World Health Organisation first issued a global alert in March 2014

 Read more

By John Burn-Murdoch and Gavin Jackson

In the latest instalment of The Baseline, our weekly feature on sports statistics, we looked at Serena Williams’ dominance of women’s tennis over the last decade.

Williams has won 17 of the 43 grand slam tournaments she has entered since the 2002 French Open, and the reasons for her success can be explained with a look at performance data for the top players of the modern era Read more