Although Kolkmann admits that concrete courts cost substantially more initially than asphalt, an asphalt surface often requires more frequent and costly upkeep over its lifespan to repair cracking and settling. "Through our own recordkeeping, we estimate that an asphalt court will be unavailable for play, due to repairs being made, for about 100 days over a 20-year period," he says. "During this same time, a post-tensioned slab would be down for about 20 days. In our climate in the upper Midwest, repairs can only be done in the summer, when everyone wants to play. For a private court, the downtime may not be as crucial. But for a club, it can be a substantial unknown cost in lost revenue."
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Generating effortless power on the tennis forehand is right up there on any tennis players wish list. The trouble is when most players think about generating more power they tighten up, their muscles get stiff and they try to muscle the ball. In this video Top Tennis Training coach Simon Konov will help you get more power on your forehand with one simple trick.
Pitchfork writer Lindsay Zoladz applauded the song's narrative for "exposing irony and even hypocrisy without coming off as preachy or moralistic".[50] On behalf of Consequence of Sound, Jon Hadusek selected the song as an "essential" track of Pure Heroine regarding its narrative lyrics portraying Lorde's songwriting that was "beyond her years".[46] Time Out editor Nick Levine similarly lauded Lorde's "compelling" songwriting ability despite her young age at the time and praised the song's composition as "glorious".[45] AllMusic's Stephen Thomas Erlewine and The Independent's Andy Gill also picked "Tennis Court" as a standout track of Pure Heroine,[51][52] while John Murphy from musicOMH complimented the track as "impossible not to sing along to".[53] In a less enthusiastic review, Evan Sawdey of PopMatters considered the song a "drawback" that does not "[suit] her well".[54]

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The Challenger Tour for men is the lowest level of tournament administered by the ATP. It is composed of about 150 events and, as a result, features a more diverse range of countries hosting events.[92] The majority of players use the Challenger Series at the beginning of their career to work their way up the rankings. Andre Agassi, between winning Grand Slam tournaments, plummeted to World No. 141 and used Challenger Series events for match experience and to progress back up the rankings.[93] The Challenger Series offers prize funds of between US$25,000 and US$150,000.
The rules of modern tennis have changed little since the 1890s. Two exceptions are that from 1908 to 1961 the server had to keep one foot on the ground at all times, and the adoption of the tiebreak in the 1970s. A recent addition to professional tennis has been the adoption of electronic review technology coupled with a point-challenge system, which allows a player to contest the line call of a point, a system known as Hawk-Eye.
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