We should have a clearer indication as to whether interim WBC welterweight king Robert Guerrero is a great fighter or simply very good, when he locks horns with ex WBC and IBF belt holder Andre Berto at the Citizen’s Business Bank Arena, Ontario, California this Saturday.

Josesito Lopez pulled off a huge upset win by halting Victor Ortiz in the ninth round of their welterweight clash on Saturday night at the Staples Center in Los Angeles.

Lopez stepped in as a replacement after Andre Berto failed a drug test and he bravely stood and traded with Ortiz, who was ahead on the judges’ scorecards when he quit the fight due to a broken jaw.

IBO cruiserweight champion Antonio Tarver has tested positive for the banned anabolic steroid drostanolone, from a sample taken before his June 2 defence against Lateef Kayode at the Home Depot Center in California.

Tarver fought his younger opponent to a draw that night but the result is likely to be changed to a no-decision after the veteran failed the urine test administered by the California State Athletic Commission (CSAC).

Victor Ortiz officially announced that he would face Josesito Lopez at the Staples Center on June 23 for the WBC welterweight silver title, yesterday, after original opponent Andre Berto failed a drug test.

Just weeks after Amir Khan and Lamont Peterson’s highly anticipated rematch was called off due to a failed drugs test another blockbuster return was thrown into jeopardy yesterday after it was revealed Andre Berto failed a drugs test.

Former three-division world champion Robert Guerrero and undefeated number one rated WBC welterweight contender Selcuk Aydin came together via video link on Thursday to announce their July 28 clash at the HP Pavilion in San Jose, California.

The pair will square off for the WBC interim welterweight world championship and Aydin who had already began his training camp in Stuttgart, Germany, addressed members of the media via Skype.

Welterweight contenders Victor Ortiz and Andre Berto came together in Los Angeles on Monday to formally announce their upcoming rematch of the 2011 Fight of the Year on June 23 at the Staples Center.

The eagerly anticipated rematch is back on after having been postponed from its original date of February 11 when Berto sustained an arm injury in training.

Kell Brook insists he is fully focussed on beating Matthew Hatton in their War of the Roses clash this Saturday, despite constantly being linked with mega fights against the world’s best.

The Sheffield star headlines the biggest fight of his career at the Motorpoint Arena Sheffield live on Sky Sports 1, HD1 and in 3D, and it is a contest that could see the victor emerge with a world title shot.

The upcoming rematch between Victor Ortiz and Andre Berto has been thrown into doubt after Berto picked up an arm injury in sparring, making their February 11 date impossible.

Former two-time welterweight champion Berto ruptured his left bicep in a sparring session with Tureano Johnson and will require surgery that could put the bout off for at least several weeks according to sources in the know.