Diego Costa returned to haunt Arsenal once again as he scored the only goal in Chelsea's 1-0 victory at the Emirates having been involved in Per Mertesacker's sending-off.

Arsene Wenger's Premier League title hopefuls started brightly, but suffered a massive setback as Mertesacker was given his marching orders after 18 minutes.

Chelsea broke forward through Willian, and the Brazilian's weighted pass in behind Mertesacker led to the World Cup winner sliding in on Costa as last man to receive a red card from Mark Clattenburg.

Danny Garcia overcame a sluggish start to win a unanimous decision over Robert Guerrero at the Staples Center in Los Angeles last Saturday and claim the WBC welterweight title vacated by Floyd Mayweather Jr.

With Mayweather, who retired in September, sitting ringside, Garcia (32-0) took control from the middle rounds and was awarded the decision 116-112 by all three judges.

Defending champion Novak Djokovic survived a scare against Gilles Simon to reach the last eight of the Australian Open in Melbourne.

Five-time champion Djokovic made 100 unforced errors but prevailed 6-3 6-7 (1-7) 6-4 4-6 6-3 after four hours and 32 minutes on Rod Laver Arena.

Djokovic, 28, is through to his 27th consecutive Grand Slam quarter-final.

John Stones will be at centre of a £50m transfer scramble in the summer, with Real Madrid, Barcelona, Manchester City and Chelsea all keen to sign him.

Everton turned down the opportunity to sell their highly-rated centre half last summer, rejecting a £38million bid from Chelsea.

But the interest in Stones has intensified since then, with Rafa Benitez having asked Real Madrid to sign him when he was manager at the club.

Lionel Messi returned from injury to send Barcelona back to the top of La Liga as they won at Malaga.

Messi missed the midweek Copa Del Rey win at Athletic Bilbao with a hamstring problem, but came back to volley in Adriano's cross for the decisive goal.

Munir El Haddadi gave Barca the lead with a tap-in after 70 seconds.

Daniel Amartey has begun training with his new club, Leicester City, after completing a £5m deal from the Danish club for four-and-a-half year.

The Ghana international becomes Claudio Ranieri's second capture of the transfer window after the acquisition of Demarai Gray from Birmingham City.

Amartey, who has won six caps for the senior side after making his debut against Senegal in 2015, plays as a central-midfielder and can also cover at right-back.

Speaking to the club's website Amartey said: 'It's a great pleasure to join Leicester City. I know the club have been interested in signing me for some time and that was a big part of my decision to come here.

Swansea recorded their first ever league win over Everton as they hung on to record a 2-1 success in Francesco Guidolin's first game as manager, thanks to Andre Dede Ayew, who was instrumental in both goals by the Swans.

The visitors went in front through Gylfi Sigurdsson's penalty after Tim Howard brought down Andre Ayew following John Stones' weak backpass.

Gareth Barry's deflected flick made it 1-1 just eight minutes later but Ayew restored the advantage with an effort which looped in over Howard off Stones.

Roger Federer, the Swiss third seed, produced a masterclass to reach the Australian Open quarter-finals, easing past David Goffin in straight sets yesterday.

Federer barely broke sweat in his 6-2 6-1 6-4 dismantling of the talented Belgian, 15th seed on Rod Laver Arena.

The 17-time grand slam champion was in control throughout, only dropping serve once as he beat Goffin for the fourth time in as many meetings to earn a last-eight showdown with sixth seed Tomas Berdych.

It was a late start in Melbourne, with the marathon five-setter between Novak Djokovic and Gilles Simon earlier in the day forcing back the scheduled times on court.

Diego Costa once again proved to be Arsenal's undoing with the Chelsea man scoring the only goal as the reigning Barclays Premier League champions beat the 10-man Gunners yesterday.

Having tussled with Gabriel and Laurent Koscielny in September's reverse fixture at Stamford Bridge, Costa was again the villain of the piece from an Arsenal perspective as he proved the catalyst in Chelsea's 1-0 win - a result which leaves the Gunners in third behind both Leicester and Manchester City.

Twenty-four-year-old Felix Lartey from the Ghana Immigration Service defeated Bernard Joe Sam from Ghana Revenue Authority 3-0 in the finals of the national table tennis top eight competition held at the D.G Hathiramani Sports Hall at the Accra Stadium on Saturday to scoop the top prize and a cash prize of GHC2000.

In a keenly contested competition Beatrice Gyasi from the Ghana Police Service defeated Bernice Borquaye from the Ghana Armed Forces 3-1 to win the female category and a cash amount of GHC1500.

In the third and fourth placed matches, defending champion Derek Abrefa of Immigration beat fellow pal from Immigration 3-1 to take the third place in the male category while in the female category Linda Annor of Immigration beat pupil teacher Gina Ackman 3-0.

In a competition which featured the best eight male and female players of the country , all participants were rewarded with appearance fees and cash prizes.

The vice chairman of the Ghana Table

An impressive attacking display by DR Congo saw them beat Angola 4-2 in a thrilling six-goal encounter in their CHAN 2016 Group B encounter yesterday.

DR Congo took the lead in the eigth minute following a corner kick. A header towards the far post saw Angola's keeper fumble the ball under pressure and the ball spun off his back and back into play from which Nelson Munganga pounced and poked home the game's opening goal.

Just a few minutes after the goal, Angola came close to a leveller when a cross reached captain Osvlado only for him to slice his shot off the side of his boot from a very good position.

Manchester United is expected to become world football's biggest earners in the next 12 months.

Real Madrid topped Deloitte's Football Money League for the 11th consecutive year, generating 577m euros (£439m) in 2014-15.

Barcelona is second with 560.8m euros (£426.6m), with United third on 519.5m euros (£395.2m).

But Deloitte said there was a "strong possibility" United would overtake the La Liga sides in next year's edition.

Deloitte is a professional services firm, whose sports business group produces an annual table of the clubs with the highest revenues.

Premier League leaders Arsenal will aim to maintain the top spot in the league as Arsene Wenger’s side welcome the reigning Champions Chelsea to the Emirates on Sunday.

The Emirates side look like real title contenders this season, having maintained their form throughout the period and ranking on top in terms of goal difference ahead of second placed Leicester City.

The travelling side, however, are a fading force who currently sit 13th in the league position, and their chance at Champions League next summer is almost out of hand.

A win against the London rivals Chelsea will see Arsenal bolster their credentials to keep hold of their position and become the league winners for the first time since 2004.

Liverpool have made an approach to sign Shakhtar Donetsk's Brazilian attacker Alex Teixeira as Jurgen Klopp attempts to secure his first major signing since becoming manager at Anfield.

The Reds are willing to pay about £24.5m for the 26-year-old.

However, the Ukrainian club value Teixeira, who has also been linked with Chelsea, at closer to £39m.

Manny Pacquiao has promised to put on a show when he brings the curtain down on his illustrious career against Timothy Bradley on April 9.

The Filipino fighter has not been in the ring since losing on points to Floyd Mayweather in the richest bout in boxing history last May.

Pacquiao is now set to end his career against Bradley in Las Vegas, with the duo holding one win each from their previous two bouts.