India's Somdev Devvarman will clash with Feliciano Lopez of Spain in Men's singles first round of the Australian Open Grand Slam Tennis tournament in Melbourne today.In another match, top seeded Spaniard Rafael Nadal will meet Bernard Tomic of Australia.Fourth seeded Andy Murray of Great Britain, and sixth seeded Roger Federer will also open their campaign today. Men's defending champion Serbia's Novak Djokovic yesterday defeated Lukas Lacko of Slovakia 6-3, 7-6, 6-1 to reach the second round.In Women's singles, Russia's Maria Sharapova, Victoria Azarenka of Belarus and Polish Agnieszka Radwanska among others will play their first round matches.Women's title favourite Serena Williams yesterday entered the second round of the singles competition.Williams kicked off her bid for an 18th grand slam title with a 6-2 6-1 demolition of local wildcard Ashleigh Barty.China's Li Na also advanced to the second round defeating last year's girls' champion Ana Konjuh, 1-6, 6-2, 6-0. In the first round upsets in the women's singles yesterday, Thai world number 88 Luksika Kumkhum bundled out sixth seed Petra Kvitova 6-2, 1-6, 6-4. The seven-time Grand Slam champion Venus Williams became another major casualty when she threw away a one-set lead against Russian 22nd seed Ekaterina Makarova to slump to her worst Australian Open result since 2006. She lost 6-2, 4-6, 4-6.