Masahiro Tanaka is the Diamondbacks' No. 1 target, according to Ken Rosenthal of FOX Sports (on Twitter). The D'Backs continue to explore trades and free agents as they await the decision on whether Tanaka will be posted.

Arizona has made no secret of their desire to land a frontline starter. Tanaka, who is widely regarded as the top arm on the open market this winter, would certainly fit the bill.

The MLB and NPB are said to be in agreement on a new posting system and it should be ratified by the MLB Executive Council on Monday. MLB fully expects the Golden Eagles ace to be posted.