  We summarize and combine the results on the direct measurements of the mass
of the W boson in data collected by the Tevatron experiments CDF and D0 at
Fermilab. Earlier results from CDF Run-0 (1988--1989), D0 and CDF Run-I
(1992--1995) and D0 results from 1/fb (2002--2006) of Run-II data are now
combined with two new, high statistics Run-II measurements: a CDF measurement
in both electron and muon channels using 2.2/fb of integrated luminosity
collected between 2002 and 2007, and a D0 measurement in the electron channel
using 4.3/fb collected between 2006 and 2009. As in previous combinations, the
results are corrected for inconsistencies in parton distribution functions and
assumptions about electroweak parameters used in the different analyses. The
resulting Tevatron average for the mass of the W boson is Mw = 80387 +- 16 MeV
and a new world average including data from LEP II is Mw = 80385+- 15 MeV.
