Treasury yields are on the rise. Short-term yields that slipped into negative territory in December and hovered near zero for most of January have begun to inch up.

The move higher is more pronounced farther out on the yield curve. On Jan. 30, 12-month T-bill yields were up 13 basis points to 0.47% from year-end. Over the same period, the 10-year generic U.S. government yield rose nearly 63 basis points to 2.84%, while the 30-year yield gained almost 93 basis points to 3.60%.

The

Federal Reserve

would like to keep interest rates low to encourage borrowing by consumers and businesses to resuscitate economic growth. However, unprecedented government deficits as far as the eye can see, coupled with the expectation of record borrowing levels to pay for the upcoming stimulus package, can't be ignored. To fund this borrowing, higher rates are starting to be demanded.

Bond prices move in the opposite direction to their yields. The recent pull-back from the massive flight to quality of U.S. government debt has sent prices lower and yields up. Two of the best-performing fixed-income mutual funds in January bet on higher interest rates.

The top-performing open-end, fixed-income fund in January is the

ProFunds Rising Rates Opportunity ProFund

(RRPIX) - Get ProFunds Rising Rates Opport Inv Report

, which gained 20.13% during the month. The fund is 125% leveraged to the inverse price movements of recently issued long bonds.

Similarly, the

Rydex Series -- Inverse Government Long Bond Strategy Fund

(RYJUX) - Get Rydex Inverse Gov Long Bond Inv Report

TheStreet Recommends

is designed to increase in value as bond prices fall. This resulted in a January advance of 14.31%.

The other eight funds listed below focus on various geographic segments of the municipal bond market. Unfortunately, every single one of the muni funds charges investors either a front or back load, tagging investors either coming or going.

The top-performing

Eaton Vance National Municipals Fund

(EANAX) - Get Eaton Vance National Muni Inc A Report

returned 12.59% for the period under review. The fund holds nationwide municipal securities to gather income exempt from U.S. federal taxes. It charges a 4.75% front load.

The next best performer of the single-state muni funds is the

Eaton Vance Virginia Municipals Fund

(EVVAX)

, which rose 11.44%. By investing municipal securities only from Virginia, income from the fund is exempt from Virginia state personal income taxes. Exiting this fund triggers a 5% back load.

For more information, check out an

explanation of our ratings

.

Kevin Baker became the senior financial analyst for TSC Ratings upon the August 2006 acquisition of Weiss Ratings by TheStreet.com, covering mutual funds. He joined the Weiss Group in 1997 as a banking and brokerage analyst. In 1999, he created the Weiss Group's first ratings to gauge the level of risk in U.S. equities. Baker received a B.S. degree in management from Rensselaer Polytechnic Institute and an M.B.A. with a finance specialization from Nova Southeastern University.