Sport pictures of the week

Manchester, UK, March 29: Cristiano Ronaldo of Manchester United scores with a back-heel against Aston Villa in their Premier League fixture Photograph: Tom Jenkins/Guardian

Manchester,UK, March 29: Wayne Rooney celebrates scoring against Aston Villa at Old Trafford Photograph: Tom Jenkins/Guardian

San Jose, USA, March 30: Nastia Liukin of the United States performs on the balance bar during the 2008 Pacific Rim Gymnastics Championships Photograph: Greg Trott /Getty

Hong Kong, China, March 30: Alatasi Tupou of Samoa scores a try against England during their quarter-final of the Hong Kong Rugby Sevens. Samoa won 17-12 Photograph: Vincent Yu /AP

Manchester, UK, March 30: Alois Kankovsky competes during the men's Omnium sprint 200m time trial in the UCI Track Cycling World Championships Photograph: Andrew Yates/AFP

Los Angeles, USA, March 30: Kobe Bryant of the Los Angeles Lakers goes up for a reverse lay-up against the Washington Wizards Photograph: Noah Graham /Getty

Marbella, Spain, March 30: Thomas Levet celebrates with Christian Cevaer and Grégory Bourdy after his final round at the Open de Andalucia Photograph: Ross Kinnaird/Getty

Manchester, UK, March 30: Teun Mulder realises that he's the new world champion of the men's 1km time trial at the UCI Track Cycling World Championships Photograph: Olaf Kraak /AFP

Key Biscayne, USA, March 31: Serena Williams reacts after a point against Kaia Kanepi during the Sony Ericsson Open Photograph: Clive Brunskill/Getty

Minneapolis, USA, April 2: Howie Kendrick, of the Los Angeles Angels is hit by a pitch from the Minnesota Twins' Nick Blackburn Photograph: Paul Battaglia/AP

Key Biscayne, USA, April 2: Rafael Nadal returns a shot against James Blake Photograph: Clive Brunskill /Getty

Ouarzazate, Morocco, April 2: Two competitors feel the heat during the fourth stage of the Sand Marathon Photograph: Pierre Verdy/AFP

Paris, France, April 2: Pauleta of Paris Saint Germain celebrates a goal, scored by his team-mate Amara Diane, against Strasbourg Photograph: Patrick Herzog/AFP

Sydney, Australia, April 3: Chris Yarrow performs an aerial manoeuvre during the Australian wakeboarding championships Photograph: Cameron Spencer/Getty

Port of Spain, Trinidad and Tobago, April 3: Fidel Edwards of the West Indies dives for a ball in the first innings of the second test against Sri Lanka Photograph: Stan Honda/AFP