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Thomas Muster has called on tennis officials to act over comments by Boris Becker about his dramatic return to form in last week's Monte Carlo Open final. Muster demanded the ATP either suspend or fine Becker. He also revealed he had voluntarily undergone a drugs test on Tuesday to counter recent allegations.

ATP TOURNAMENT (Atlanta, Georgia) Men's second round: M Chang (US) bt W McGuire (US) 6-1 6-2; C Ruud (Nor) bt C Adams (US) 6-4 6-1; M Larsson (Swe) bt Jakob Hlasek (Swit) 1-6, 6-3, 6-3.

Doubles: K Flach and R Seguso (US) bt A Florent (Aus) and J Winnink (Neth) 6-2 6-4; R Bergh and M Larsson (Swe) bt D Perez (Uru) and M Wilander (Swe) 6-7 6-3 6-2; A Antonitsch (Aut) and J Hlasek (Swit) bt K Kinnear and K Thorne (US) 6-3 5-7 7-6; Steven and T Woodbridge (Aus) bt L Jensen and M Jensen (US) 5-7 6-2 6-3.

MUNICH OPEN Second round: G Schaller (Aut) bt J Sanchez (Sp) 6-3 6-2; M Filippini (Uru) bt H Dreekmann (Ger) 6-1 3-6 6-3; S Schalken (Neth) bt B Karbacher (Ger) 7-6 6-7 7-6; A Corretja (Sp) bt M Sinner (Ger) 6-2 6-2.

Mary Pierce was forced to retire from the Citizen Cup in Hamburg yesterday, withdrawing from her match against Petra Begerow of Germany with dizziness and nausea. Pierce had pulled out of the doubles earlier in the week after suffering from a kidney infection.

HAMBURG WOMEN'S OPEN Second round: J Kandarr (Ger) bt B Schultz (Neth) 6-3 7-6; J Wiesner (Aut) bt W Probst (Ger) 6-1 6-4; A Huber (Ger) bt A Grossman (US) 6-3 6-1; P Begerow (Ger) bt M Pierce (Fr) 3-6 7-5 3-0 ret.

LTA SPRING SATELLITE (Edinburgh) Men's second round: L Milligan (GB) bt B Larkham (Aus) 6-3 6-1; T Larkham (Aus) bt N Baglin (GB) 6-2 6-2; O Stanoichev (Bul) bt B Curry (SA) 6-4 7-5; A Foster (GB) bt J Delgado (GB) 6-2 6-2; M Maclagan (GB) bt A Caspari (Ger) 6-1 6-4; R Matheson (GB) bt C Wall (GB) 5-7 6-3 6-2; A Belobrajdic (Aus) bt P Hand (GB) 7-6 6-1; G Doyle (Aus) bt P Langvardt (Den) 6-1 6-4. Women's quarter-finals: C Habernigg (Aut) bt N Egorova (Rus) 6-1 6-1; P Plackova (Cz Rep) bt R Mawdsley (Aus) 6-3 6-3; M Javer (GB) bt L Woodroffe (GB) 6-4 5-7 6-4; D Chladkova (Cz Rep) bt E Fauth (Aut) 6-3 3-6 6-3.