Naomi Osaka's return to Japan's Fed Cup team after a year's absence turned sour on Friday as the world No. 10 suffered a thrashing at the hands of world No. 78 Sara Sorribes Tormo from Spain.

The two-time Grand Slam champion was expected to give Japan a huge boost in their bid to overcome five-time champions Spain at the La Manga Club near Murcia, Spain, but lost 6-0 6-3.

Osaka, whose Australian Open title defense was ended by 15-year-old American Coco Gauff, looked totally ill at ease on the clay as she racked up 50 unforced errors in a torrid display against the 23-year-old Spaniard who claimed only a second Fed Cup singles win.

"Honestly, it wasn't even a match," an emotional Osaka said. "For me I'm kind of dealing with some stuff and I couldn't mentally get into the match. It's sort of... my fault."

"We knew Sara could make it very uncomfortable for Naomi and she stuck to the game plan perfectly," said Spain captain Anabel Medina Garrigues.

Claycourt specialist Carla Suarez Navarro, playing in her last home tie for Spain, then beat Misaki Doi 6-3 6-4 to put Spain 2-0 ahead going into Saturday's reverse singles.

The winners of the eight qualifying ties will join four automatic entries, holders France, Australia, Czech Republic and hosts Hungary, in the inaugural Fed Cup Finals featuring 12 nations in Budapest in April.

In other words, Spain need to win just one of Saturday's three rubbers to book their place in the event.

Match results on Friday:

Netherlands 1-1 Belarus

Romania 1-1 Russia

Brazil 0-2 Germany

Spain 2-0 Japan

Switzerland 2-0 Canada

Belgium 1-1 Kazakhstan

Slovakia 2-0 Great Britain