Olympic and world champion Marileidy Paulino extended her unbeaten streak by winning the women’s 400m at the first day of the Diamond League finals in Brussels on Friday. Paulino, of the Dominican Republic, timed 49.45 seconds for the victory and is unbeaten in one-lap competition since last year’s Diamond League meet in Silesia, Poland. “I ran a decent race at the end of a very long season,” said Paulino. “Of course I would have loved to run faster and closer to my personal best, but it was really, really cold tonight. “This season was fantastic for me. With the golden medal in Paris, I can say now that I won all the titles that I could win. “Still that doesn’t mean that I don’t have any goals left for the next seasons. I want to become better and still win medals at the major championships.” Paulino’s winning time, however, was bettered by American hurdles star Sydney McLaughlin-Levrone in an invitational race. “Running the 400m at the end of the season definitely hurts a little bit more and I felt the cramping,” McLaughlin-Levrone said. “That is why I chose to run with long paints, just to be safe. But I felt strong during the race.” The American, who improved her own world record when winning back-to-back Olympic 400m hurdles golds in Paris, had not competed at a Diamond League event this season and was therefore ineligible for the finals. But organisers managed to lure McLaughlin-Levrone, who won a second Olympic gold in Paris with the US 4x400m relay team, to Belgium to race in invitational 200 and 400m flat races as a way to “honour” her Olympic achievements.