The trial court did not abuse its discretion in awarding costs against plaintiff under CCP 2033.420 for having denied defendant’s requests of admission regarding the breach of oral promise claim alleged in the complaint. The evidence at trial showed that plaintiff could not have maintained a good faith belief, at the time he denied those requests, that he would prevail on the oral contract issue at trial. He relied on one brief telephone conversation in which none of the details of a $515,000 construction contract were discussed or agreed upon. The fact that plaintiff survived a summary judgment motion and a motion for directed verdict on the oral contract claim did not bar the award of costs against him under section 2033.420.