It was the first trading day of 2018 in Japan

New Years holidays ended and Japanese traders came back to the office in a good mood today, boosting the Nikkei 225 by 3.26%.

The jump helped the index break out of a two-month range to the best levels since 1991.

There is a long-term correlation between USD/JPY and the Nikkei 225 that's come unhinged recently. A recoupling would send the pair to 125.00.