* Benfica win title after 0-0 draw
* Rivals Porto held 1-1 at Belenenses (Adds detail, quotes)
LISBON, May 17 (Reuters) - Benfica won the Portuguese league for the second year running on Sunday with one game to spare when they drew 0-0 at Vitoria Guimaraes and rivals Porto were held 1-1 at Belenenses.
Porto were on course to take the title race to the final weekend when Colombia forward Jackson Martinez gave them a first-half lead, turning in a cross at the near post for his 21st goal of the season.
But their chances evaporated on a hot afternoon when Tiago Caeiro snatched an 85th minute equaliser, firing home from close range after Dalcio's pass opened up the Porto defence.