Tokyo - Tokyo stocks opened lower Monday on worries over Japanese corporate earnings outlooks and the course of the US economy, sending the key Nikkei 225 Stock Average to a two-week low below 13,000 level.

The Nikkei index fell 133.53 points, or 1.02 per cent, to 12,961.06.

The broader Topix index of all first-section issues was also down 17.57 points, or 1.38 per cent, to 1,255.36.

On currency markets at 9 am (0000 GMT), the dollar was quoted at 107.53-58 yen, up from Friday's 5 pm quote of 107.43-44 yen.

The euro was quoted at 1.5565-70 dollars, down from Friday's 5 pm quote of 1.5574-75 dollars, and at 167.43-48 yen, up from 167.32-36 yen. (dpa)