March 18 (Reuters) - U.S. stock index futures struggled for direction on Tuesday ahead of the Federal Reserve's upcoming meeting that will be closely monitored for commentary from the central bank on the potential economic ramifications of ongoing tariff disputes..N** Alibaba Group Holding Ltd BABA.N:BUZZ - Climbs on report highlighting positive reviews for QuarknL1N3Q103S

** Tesla Inc <TSLA.O>:BUZZ - RBC cuts Tesla's PT as competition intensifies; shares downnL4N3Q10IA

** Harrow Inc <HROW.O>:BUZZ - Jumps on predicting Q4 sales above estimate nL4N3Q10MK

** Tencent Music Entertainment Group <TME.N>:BUZZ - Rises on upbeat quarterly revenue nL4N3Q10MV

** Coinbase Global Inc <COIN.O>:BUZZ - Bernstein starts Coinbase with 'outperform' on positive regulatory outlooknL4N3Q10P3

** Lucid Group Inc <LCID.O>:BUZZ - Rises after Morgan Stanley upgrades to 'equal-weight'nL4N3Q10Q9

** Entergy Corp <ETR.N>:BUZZ - Slips on $1.3 bln share offeringnL6N3Q10FN

** Alpha Cognition Inc <ACOG.O>:BUZZ - H.C. Wainwright starts coverage on Alpha Cognition, bullish on next-gen Alzheimer's therapynL4N3Q10QO

** Block Inc <XYZ.N>:BUZZ - Gains after KBW upgrades to 'outperform'nL4N3Q10P2

** Genius Sports Ltd <GENI.N>:BUZZ - Guggenheim starts coverage on Genius Sports with 'buy' on platform, balance sheet strength nL4N3Q10S9

(Compiled by Rajarshi Roy and Siddhi Mahatole)

((siddhi.mahatole@thomsonreuters.com))