FOOTBALL: Apr 1-2 Champions League quarter-final 1st leg
FOOTBALL: Apr 3 UEFA Cup quarter-final 1st leg
RACING: Apr 3-5 Aintree: Grand National meeting
FOOTBALL: Apr 5-6 FA Cup semi-finals
FOOTBALL: Apr 8-9 Champions League quarter-final 2nd leg
FOOTBALL: Apr 10 UEFA Cup quarter-final 2nd leg
GOLF: Apr 10-13 Georgia: The Masters
ATHLETICS: Apr 13 London: Flora London Marathon
SNOOKER: Apr 19-May 5 Sheffield: World Championship
RUGBY LEAGUE: Apr 20 Carnegie Challenge Cup fourth round
FOOTBALL: Apr 22-23 Champions League semi-final first legs
FOOTBALL: Apr 24 UEFA Cup semi-final first legs
FOOTBALL: Apr 29-30 Champions League semi-final 2nd legs

The month in detail:

RACING: Apr 1 Folkestone, Great Leighs (tbc), Wetherby
FOOTBALL: Apr 1-2 Champions League quarter-final first legs
RACING: Apr 2 Catterick, Kempton, Lingfield, Nottingham
FOOTBALL: Apr 3 UEFA Cup quarter-final first legs
RACING: Apr 3 Aintree, Great Leighs (tbc), Leicester, Taunton
GOLF: Apr 3-6 Estoril Open
GOLF: Apr 3-6 Texas: Houston Open
ATHLETICS: Apr 4 Milan: Stramilano Half Marathon
RACING: Apr 4 Aintree, Great Leighs (tbc), Southwell, Wolverhampton
RACING: Apr 5 Aintree (including Grand National), Chepstow, Kempton, Lingfield, Newcastle
FOOTBALL: Apr 5-6 FA Cup semi-finals
ICE HOCKEY: Apr 5-6 Nottingham: Elite League play-off finals weekend
MOTOR RACING: Apr 6 Bahrain Grand Prix
MOTOR CYCLING: Apr 6 Spain: World Superbikes
ATHLETICS: Apr 6 Dublin: Great Ireland Run
RACING: Apr 6 Hexham, Market Rasen, Worcester
RACING: Apr 7 Kelso, Kempton, Plumpton
TENNIS: Apr 7-13 Florida: Bausch and Lomb Championships
RACING: Apr 8 Lingfield, Sedgefield, Southwell
FOOTBALL: Apr 8-9 Champions League quarter-final second legs
RACING: Apr 9 Bath, Kempton, Ludlow, Towcester
SWIMMING: Apr 9-13 Manchester: FIA World Short Course Championships
FOOTBALL: Apr 10 UEFA Cup quarter-final second legs
CRICKET: Apr 10-13 Lord's: MCC v Sussex
GOLF: Apr 10-13 Georgia: The Masters
RACING: Apr 10 Carlisle, Folkestone, Fontwell, Great Leighs (tbc), Towcester
RACING: Apr 11 Ascot, Doncaster, Musselburgh, Wolverhampton
RACING: Apr 12 Doncaster, Great Leighs (tbc), Kempton, Newbury, Uttoxeter
ATHLETICS: Apr 12 Istanbul: European Cup 10,000m
MOTOR CYCLING: Apr 13 Portugal: MotoGP
ATHLETICS: Apr 13 London: Flora London Marathon
ATHLETICS: Apr 13 Turin: Turin Marathon
ATHLETICS: Apr 13 Rotterdam: Fortis Marathon
RACING: Apr 13 Great Leighs (tbc), Kelso, Newton Abbot
RACING: Apr 14 Newcastle, Windsor, Wolverhampton
TENNIS: Apr 14-20 Valencia: Open de Tennis Comunidad Valenciana
TENNIS: Apr 14-20 Houston: Men's Clay Court Championships
TENNIS: Apr 14-20 Estoril Open
TENNIS: Apr 14-20 Charleston: Family Circle Cup
RACING: Apr 15 Exeter, Nottingham, Warwick
CRICKET: Apr 16 Start of LV County Championship season
RACING: Apr 16 Beverley, Cheltenham, Newmarket, Wolverhampton
RACING: Apr 17 Cheltenham, Great Leighs (tbc), Newmarket, Ripon
GOLF: Apr 17-20 Beijing: Volvo China Open
GOLF: Apr 17-20 South Carolina: Verizon Heritage
RACING: Apr 18 Ayr, Cheltenham, Great Leighs (tbc), Newbury, Taunton, Thirsk
MOTOR RACING: Apr 18-19 Pirelli International Rally
ATHLETICS: Apr 19 Belgrade: Belgrade Marathon
RACING: Apr 19 Ayr, Bangor, Newbury, Nottingham, Thirsk, Wolverhampton
SNOOKER: Apr 19-May 5 Sheffield: 888.com World Championship
RUGBY LEAGUE: Apr 20 Carnegie Challenge Cup fourth round
ATHLETICS: Apr 20 Boston: USA Olympic Team Trials
ATHLETICS: Apr 20 Beijing Marathon
ATHLETICS: Apr 20 Antwerp Marathon
RACING: Apr 20 Great Leighs, Stratford, Wincanton
RACING: Apr 21 Hexham, Plumpton, Pontefract, Sedgefield, Windsor
TENNIS: Apr 21-27 Monte Carlo: Masters Series
RACING: Apr 22 Bath, Folkestone, Kempton, Southwell, Towcester
FOOTBALL: Apr 22-23 Champions League semi-final first legs
RACING: Apr 23 Catterick, Kempton, Nottingham, Perth, Worcester
FOOTBALL: Apr 24 UEFA Cup semi-final first legs
RACING: Apr 24 Beverley, Fontwell, Great Leighs (tbc), Perth, Southwell
GOLF: Apr 24-27 Shanghai: BMW Asian Open
GOLF: Apr 24-27 Texas: EDS Byron Nelson Championship
MOTOR RACING: Apr 24-27 Jordan Rally
RACING: Apr 25 Bangor, Chepstow, Newton Abbot, Perth, Sandown, Wolverhampton
SPEEDWAY: Apr 26 Krsko: Slovenian Grand Prix
RACING: Apr 26 Haydock, Leicester, Market Rasen, Ripon, Sandown, Wolverhampton
MOTOR RACING: Apr 27 Spanish Grand Prix
MOTOR CYCLING: Apr 27 Holland: World Superbikes
ATHLETICS: Apr 27 Hamburg: Hamburg Marathon
ATHLETICS: Apr 27 Vienna: Vienna City Marathon
ATHLETICS: Apr 27 Madrid: Madrid Marathon
RACING: Apr 27 Brighton, Ludlow, Wetherby
RACING: Apr 28 Lingfield, Southwell, Towcester, Windsor, Yarmouth
CRICKET: Apr 28-30 Kent v New Zealand
TENNIS: Apr 28-May 4 Barcelona: Seat Open
TENNIS: Apr 28-May 4 Munich: BMW Open
TENNIS: Apr 28-May 4 Warsaw: J&S Cup
TENNIS: Apr 28-May 4 Fes: Grand Prix
RACING: Apr 29 Bath, Sedgefield, Southwell, Wincanton, Wolverhampton
FOOTBALL: Apr 29-30 Champions League semi-final second legs
RACING: Apr 30 Ascot, Kelso, Great Leighs (tbc), Pontefract, Worcester