One soldier died and two others were wounded Friday in a skirmish in Vavuniya district, a defense ministry official said on condition of anonymity, citing ministry regulations.
Hours later, soldiers killed four rebels during a confrontation in neighboring Mannar district, the official said.
Rebel spokesman Rasiah Ilanthirayan could not immediately be contacted for comment.
On Friday, the military said it had killed 19 other rebels in separate clashes in the north, also on Friday.
Each side in the conflict routinely exaggerates the other side's casualties, and plays down its own. Independent verification is difficult because the area is restricted to journalists.
The Tamil Tiger rebels have fought since 1983 to create an independent homeland for ethnic minority Tamils after decades of discrimination under governments controlled by the Sinhalese majority.
More than 70,000 people have been killed in the conflict.
Putin's official spokesman Dmitry Peskov commented on remarks in the US media about failures in launching nuclear-capable missiles in Russia
More than 5.8 million people voted for Nicholas Maduro at the presidential election in Venezuela. This is more than a quarter of registered voters. Why did those people vote for the man, who, as Western media write, took Venezuela to the brink of collapse?
It has long been understood that the West has been trying to subject Russian borders to total control. We have not seen such activity even during the Cold War