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We calculate the lowest-dimensional nonlocal quark and gluon condensateswithin the single instanton approximation of the instanton liquid model. As aresult, we determine the values of average virtualities of quarks $\lambda_q^2$and gluons $\lambda_g^2$ in the QCD vacuum and obtain parameterless predictionsfor the ratio $\lambda_g^2/\lambda_q^2 = 12/5$, and for some ratios ofdifferent vacuum condensates of higher dimensions. The nonlocal properties ofquark and gluon condensates are analyzed, and insufficiency of the singleinstanton approximation is discussed.Comment: 12 pages, LATEX, no figures. Revised version contains two formulae  corrected and references update

Virtualities of quarks and gluons in a QCD vacuum and nonlocal condensates within the single instanton approximation