SELECT "Driver" FROM table_20857 WHERE "Date" = 'June 23' AND "Team" = 'Penske Racing'
Name the driver for june 23 and team of penske racing
CREATE TABLE table_20857 (
    "Year" real,
    "Date" text,
    "Driver" text,
    "Team" text,
    "Manufacturer" text,
    "Laps" text,
    "Miles (km)" text,
    "Race time" text,
    "Average speed (mph)" text,
    "Report" text
)