High statistics W charge asymmetry measurements at the Tevatron
pbar p collider significantly constrain the u and d quark distributions, and
specifically the slope of the d(x)/u(x) in the x range 0.007 to 0.27.

We present measurements of lepton charge asymmetry as a function of lepton
rapidity, A(y_1) at sqrt s = 1.8 TeV for |y_1| < 2.0, for the W decays to
electrons and muons recorded by the CDF detector during the 1992-93 run
(approximately 20 pb^-1), and the first approximately 50 pb^-1 of data
from the 1994-95 run.  These precise data make possible further discrimination
between sets of modern parton distributions.  In particular it is found that
the most recent parton distributions, which included the CDF 1992-93 W
asymmetry data in their fits (MRSA, CTEQ3M and GRV94) are still in good
agreement with the more precise data from the 1994-95 run.

W charge asymmetry results from D0 based on approximately 6.5 pb^-1 data
from 1992-1993 run and approximately 29.7 pb^-1 data from 1994-1995 run, using
the W decays to muons, are also presented and are found to be consistent with
CDF results.

In addition, we present preliminary measurement of the Drell-Yan cross-section
by CDF using a dielectron sample collected during the 1993-94 run
(approximately 20 pb^-1) and a high mass dimuon sample from the combined
1993-94 and 1994-95 runs (approximately 70 pb^-1).  The measurement is in
good agreement with predictions using the most recent PDFs in a dilepton
mass range between 11 and 350 GeV/c^2.