Oct 4 (Reuters) - Wall Street’s main indexes opened lower on Monday as most big technology stocks were pressured by an uptick in Treasury yields, while Tesla shares rose after reporting a record number of electric vehicle deliveries. The Nasdaq Composite dropped 73.57 points, or 0.51%, to 14,493.12 at the opening bell, while the Dow Jones Industrial Average fell 13.50 points, or 0.04%, at the open to 34,312.96. The S&P 500 opened lower by 8.20 points, or 0.19%, at 4,348.84. (Reporting by Shreyashi Sanyal in Bengaluru; Editing by Maju Samuel) Our Standards: The Thomson Reuters Trust Principles.