First-half goals from Junior Diaz and Adam Szalai gave Mainz a 2-0 Bundesliga win at Wolfsburg, who are still searching for their first victory at home this season.
Central American powers Costa Rica are surging up the global rankings, rising 32 places in seven months and eyeing a place at South Africa 2010.
Costa Rica have already advanced to the final stage of North, Central American and Caribbean qualifying, and they saw off Haiti for their fifth win.
Mexico, Jamaica and Honduras are all still alive with a game to go in Group 2, while El Salvador booked their passage and T&T are nearly there.
After surviving the chills of his first Polish winter, Wisla Krakow defender Juior Diaz is ready to help Costa Rica reach South Africa 2010.