August 6, 2008
VIA FACSIMILE AND EDGAR
U.S. Securities and Exchange Commission
450 Fifth Street, N.W.
Washington, DC 20549
Attention: Mark A. Cowan
| Re: | Post-Effective Amendment No. 65 to Registration Statement on Form N-1A of MML Series Investment Fund (the “Trust”) (File Nos. 2-39334 and 811-2224) |
Ladies and Gentlemen:
Pursuant to Rule 461 under the Securities Act of 1933, as amended, the Trust and the Trust’s principal underwriter hereby request acceleration of the effective date for Post-Effective Amendment No.65 to the Trust’s Registration Statement on Form N-1A, referenced above, so that it will become effective at 12:01 a.m. Eastern time on Friday, August 15, 2008, or as soon as possible thereafter.
Please direct any questions concerning this request for accelerated effectiveness to Andrew M. Goldberg at (413) 744-7218.
Very truly yours, | ||
MML Series Investment Fund | ||
By: | /s/Andrew M. Goldberg | |
Name: Andrew M. Goldberg | ||
Title: Assistant Secretary | ||
MML Distributors, LLC | ||
By: | /s/Peter Lahaie | |
Name: Peter Lahaie | ||
Title: Vice President, CFO and Treasurer | ||
