Aug 7 (Reuters) - Argentina's state-controlled energy

company YPF on Thursday reported a nearly 90% plunge

in second-quarter net profit to $58 million, dragged down by

lower fuel prices.

Revenues dropped 6% from a year earlier to $4.64 billion, as

softer prices for refined products and lower seasonal demand for

naphtha weighed on sales.

YPF's performance is a critical indicator for

Argentina's economy, which is relying on the Vaca Muerta

formation in its push to become a net energy exporter.

Adjusted earnings before interest, tax, depreciation and

amortization (EBITDA) - a key measure of profitability - came in

at $1.12 billion for the April-June period, down 7% from a year

earlier.

Analysts polled by LSEG had on average expected an adjusted

EBITDA of $1.17 billion from revenues of $4.49 billion.

Benchmark Brent crude prices averaged $67 per barrel in the

second quarter, down from $75 in the previous three months and

$85 a year earlier.

The weaker Brent prices, alongside reduced conventional

output after YPF sold off mature fields, dragged down upstream

sales by some 10%.

Downstream sales, which declined 6%, were also hit by lower

fuel prices, though strong diesel and agricultural demand helped

to partially offset the drop.

The results come as Argentina faces a major legal battle

after a U.S. judge ordered the government to hand over its 51%

stake in YPF to partially satisfy a $16.1 billion judgment tied

to a 2012 expropriation of a stake from Spain's Repsol.