Abstract
The analyses and results on WW physics obtained in the first year of running of LEP2 are summarized. The determination of the W mass, both through the measurement of the WW production cross section at a center-of-mass energy of 161 GeV and through the study of the invariant mass distribution of W decay products in the 172 GeV run are described first. Preliminary results on searches for anomalous triple gauge-boson vertices are also presented.