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SAO PAULO - Brazil's Serie A kicks off this weekend with teams from Sao Paulo, Belo Horizonte and Porto Alegre the favourites for the title amid familiar worries over fan violence, low crowds and chronic disorganisation.7:35pm BSTMADRID - Rafa Nadal remains http://www.bostonherald.com/sports/ - http://www.bostonherald.com/sports/ - on course for a third straight Madrid Open title after http://www.panoramio.com/user/sherlynpopelkagolf - http://www.panoramio.com/user/sherlynpopelkagolf - sweeping past Grigor Dimitrov 6-3 6-4 in the quarter-finals on Friday.5:34pm BSTMADRID - World number one Serena Williams's 27-match unbeaten run ended with a 6-2 6-3 defeat by Petra Kvitova in the Madrid Open semi-finals on Friday.5:28pm BST